NPM/Yarn examples: Use lock file usually (#26699)

Co-authored-by: hubwriter <hubwriter@github.com>

content/actions/automating-builds-and-tests/building-and-testing-nodejs.md

@@ -137,7 +137,7 @@ If you don't specify a Node.js version, {% data variables.product.prodname_dotco
 
 ### Example using npm
 
-This example installs the dependencies defined in the _package.json_ file. For more information, see [`npm install`](https://docs.npmjs.com/cli/install).
+This example installs the versions in the _package-lock.json_ or _npm-shrinkwrap.json_ file and prevents updates to the lock file. Using `npm ci` is generally faster than running `npm install`. For more information, see [`npm ci`](https://docs.npmjs.com/cli/ci.html) and "[Introducing `npm ci` for faster, more reliable builds](https://blog.npmjs.org/post/171556855892/introducing-npm-ci-for-faster-more-reliable)."
 
 ```yaml copy
 steps:
@@ -147,10 +147,10 @@ steps:
   with:
     node-version: '18.x'
 - name: Install dependencies
-  run: npm install
+  run: npm ci
 ```
 
-Using `npm ci` installs the versions in the _package-lock.json_ or _npm-shrinkwrap.json_ file and prevents updates to the lock file. Using `npm ci` is generally faster than running `npm install`. For more information, see [`npm ci`](https://docs.npmjs.com/cli/ci.html) and "[Introducing `npm ci` for faster, more reliable builds](https://blog.npmjs.org/post/171556855892/introducing-npm-ci-for-faster-more-reliable)."
+Using `npm install` installs the dependencies defined in the _package.json_ file. For more information, see [`npm install`](https://docs.npmjs.com/cli/install).
 
 ```yaml copy
 steps:
@@ -160,12 +160,12 @@ steps:
   with:
     node-version: '18.x'
 - name: Install dependencies
-  run: npm ci
+  run: npm install
 ```
 
 ### Example using Yarn
 
-This example installs the dependencies defined in the _package.json_ file. For more information, see [`yarn install`](https://yarnpkg.com/en/docs/cli/install).
+This example installs the dependencies defined in the _yarn.lock_ file and prevents updates to the _yarn.lock_ file. For more information, see [`yarn install`](https://yarnpkg.com/en/docs/cli/install).
 
 ```yaml copy
 steps:
@@ -175,10 +175,10 @@ steps:
   with:
     node-version: '18.x'
 - name: Install dependencies
-  run: yarn
+  run: yarn --frozen-lockfile
 ```
 
-Alternatively, you can pass `--frozen-lockfile` to install the versions in the `yarn.lock` file and prevent updates to the `yarn.lock` file.
+Alternatively, you can install the dependencies defined in the _package.json_ file. 
 
 ```yaml copy
 steps:
@@ -188,7 +188,7 @@ steps:
   with:
     node-version: '18.x'
 - name: Install dependencies
-  run: yarn --frozen-lockfile
+  run: yarn
 ```
 
 ### Example using a private registry and creating the .npmrc file