Replace references to master branch with main.

CHANGELOG.md

@@ -7,7 +7,7 @@
 
 ## Improvements
 
-- Provide [jscodeshift](https://www.npmjs.com/package/jscodeshift) transform for automatically converting Apollo Client 2.x `import` declarations to use Apollo Client 3.x packages. [Instructions](https://github.com/apollographql/apollo-client/tree/master/codemods/ac2-to-ac3). <br/>
+- Provide [jscodeshift](https://www.npmjs.com/package/jscodeshift) transform for automatically converting Apollo Client 2.x `import` declarations to use Apollo Client 3.x packages. [Instructions](https://github.com/apollographql/apollo-client/tree/main/codemods/ac2-to-ac3). <br/>
   [@dminkovsky](https://github.com/dminkovsky) and [@jcreighton](https://github.com/jcreighton) in [#6486](https://github.com/apollographql/apollo-client/pull/6486)
 
 ## Apollo Client 3.1.2
@@ -115,7 +115,7 @@
 - The `updateQuery` function previously required by `fetchMore` has been deprecated with a warning, and will be removed in the next major version of Apollo Client. Please consider using a `merge` function to handle incoming data instead of relying on `updateQuery`. <br/>
   [@benjamn](https://github.com/benjamn) in [#6464](https://github.com/apollographql/apollo-client/pull/6464)
 
-  - Helper functions for generating common pagination-related field policies may be imported from `@apollo/client/utilities`. The most basic helper is `concatPagination`, which emulates the concatenation behavior of typical `updateQuery` functions. A more sophisticated helper is `offsetLimitPagination`, which implements offset/limit-based pagination. If you are consuming paginated data from a Relay-friendly API, use `relayStylePagination`. Feel free to use [these helper functions](https://github.com/apollographql/apollo-client/blob/master/src/utilities/policies/pagination.ts) as inspiration for your own field policies, and/or modify them to suit your needs. <br/>
+  - Helper functions for generating common pagination-related field policies may be imported from `@apollo/client/utilities`. The most basic helper is `concatPagination`, which emulates the concatenation behavior of typical `updateQuery` functions. A more sophisticated helper is `offsetLimitPagination`, which implements offset/limit-based pagination. If you are consuming paginated data from a Relay-friendly API, use `relayStylePagination`. Feel free to use [these helper functions](https://github.com/apollographql/apollo-client/blob/main/src/utilities/policies/pagination.ts) as inspiration for your own field policies, and/or modify them to suit your needs. <br/>
     [@benjamn](https://github.com/benjamn) in [#6465](https://github.com/apollographql/apollo-client/pull/6465)
 
 - Updated to work with `graphql@15`.  <br/>

CONTRIBUTING.md

@@ -117,8 +117,6 @@ jest --config ./config/jest.config.js --testRegex __tests__/useQuery.test.tsx
 
 It can be useful to link an Apollo Client checkout into an application, to test how Apollo Client development changes impact a real app. We'll use the [Apollo fullstack tutorial application](https://github.com/apollographql/fullstack-tutorial) to demonstrate this.
 
-> **Note:** The fullstack tutorial updates for Apollo Client 3 haven't been merged into `master` yet, so for now we'll use the tutorial's `apollo-client-3` branch.
-
 1) Clone and install Apollo Client.
 
 ```
@@ -135,7 +133,6 @@ cd ..
 ```
 git clone https://github.com/apollographql/fullstack-tutorial.git
 cd fullstack-tutorial
-git checkout apollo-client-3
 cd final/server
 npm i
 cd ../client

docs/gatsby-config.js

@@ -30,7 +30,7 @@ module.exports = {
             'index',
             'why-apollo',
             'get-started',
-            '[Changelog](https://github.com/apollographql/apollo-client/blob/master/CHANGELOG.md)',
+            '[Changelog](https://github.com/apollographql/apollo-client/blob/main/CHANGELOG.md)',
           ],
           'Fetching': [
             'data/queries',

docs/source/data/fragments.md

@@ -151,7 +151,7 @@ There's nothing special about the naming of `VoteButtons.fragments.entry` or `Re
 
 ### Importing fragments when using Webpack
 
-When loading `.graphql` files with [graphql-tag/loader](https://github.com/apollographql/graphql-tag/blob/master/loader.js), we can include fragments using `import` statements. For example:
+When loading `.graphql` files with [graphql-tag/loader](https://github.com/apollographql/graphql-tag/blob/main/loader.js), we can include fragments using `import` statements. For example:
 
 ```graphql
 #import "./someFragment.graphql"

docs/source/data/queries.mdx

@@ -202,7 +202,7 @@ function DogPhoto({ breed }) {
 }
 ```
 
-The `networkStatus` property is a `NetworkStatus` enum that represents different loading states. Refetch is represented by `NetworkStatus.refetch`, and there are also values for polling and pagination. For a full list of all the possible loading states, check out the [source](https://github.com/apollographql/apollo-client/blob/master/src/core/networkStatus.ts).
+The `networkStatus` property is a `NetworkStatus` enum that represents different loading states. Refetch is represented by `NetworkStatus.refetch`, and there are also values for polling and pagination. For a full list of all the possible loading states, check out the [source](https://github.com/apollographql/apollo-client/blob/main/src/core/networkStatus.ts).
 
 ## Inspecting error states
 

docs/source/migrating/apollo-client-3-migration.md

@@ -12,11 +12,11 @@ To illustrate the migration process, we've also made this video that uses the ex
 * Apollo Client is now distributed as the `@apollo/client` package (previous versions are distributed as `apollo-client`).
 * The `@apollo/client` package includes both React hooks and GraphQL request handling, which previously required installing separate packages.
 * Apollo Client’s cache (`InMemoryCache`) is more flexible and performant. It now supports garbage collection, storage of both normalized and non-normalized data, and the customization of cached data with new `TypePolicy` and `FieldPolicy` APIs.
-* The update also includes numerous bug fixes and optimizations, as described in the [changelog](https://github.com/apollographql/apollo-client/blob/master/CHANGELOG.md).
+* The update also includes numerous bug fixes and optimizations, as described in the [changelog](https://github.com/apollographql/apollo-client/blob/main/CHANGELOG.md).
 
 ## Installation
 
-> **WARNING:** Apollo Client 3.0 is a major-version release that includes **breaking changes**. If you are updating an existing application to use Apollo Client 3.0, please see the [changelog](https://github.com/apollographql/apollo-client/blob/master/CHANGELOG.md) for details about these changes.
+> **WARNING:** Apollo Client 3.0 is a major-version release that includes **breaking changes**. If you are updating an existing application to use Apollo Client 3.0, please see the [changelog](https://github.com/apollographql/apollo-client/blob/main/CHANGELOG.md) for details about these changes.
 
 Install Apollo Client 3.0 with the following command: