Fix more instances of incorrect test configuration (#2906)

Author: jennifer-shehane

source/api/cypress-api/isbrowser.md

@@ -146,14 +146,14 @@ it('test', () => {
 If you want to target a test or suite to run or be excluded when run in a specific browser, we suggest passing the `browser` within the {% url "test configuration" configuration#Test-Configuration %}.  The `browser` option accepts the same {% urlHash "arguments" Arguments %} as `Cypress.isBrowser()`.
 
 ```js
-it('Download extension in Firefox', { browser: 'firefox' } => {
+it('Download extension in Firefox', { browser: 'firefox' }, () => {
   cy.get('#dl-extension')
     .should('contain', 'Download Firefox Extension')
 })
 ```
 
 ```js
-it('Show warning outside Chrome', {  browser: '!chrome' } => {
+it('Show warning outside Chrome', {  browser: '!chrome' }, () => {
   cy.get('.browser-warning')
     .should('contain', 'For optimal viewing, use Chrome browser')
 })

source/guides/guides/continuous-integration.md

@@ -717,6 +717,7 @@ module.exports = (on, config) => {
   })
 }
 ```
+
 ## Xvfb
 
 When running on Linux, Cypress needs an X11 server; otherwise it spawns its own X11 server during the test run. When running several Cypress instances in parallel, the spawning of multiple X11 servers at once can cause problems for some of them. In this case, you can separately start a single X11 server and pass the server's address to each Cypress instance using `DISPLAY` variable.

source/guides/guides/cross-browser-testing.md

@@ -192,7 +192,7 @@ You can specify a browser to run or exclude by passing a matcher to the suite or
 
 ```js
 // Run the test if Cypress is run via Firefox
-it('Download extension in Firefox', { browser: 'firefox' } => {
+it('Download extension in Firefox', { browser: 'firefox' }, () => {
   cy.get('#dl-extension')
     .should('contain', 'Download Firefox Extension')
 })
@@ -206,7 +206,7 @@ describe('happy path suite', { browser: 'firefox' }, () => {
 
 // Ignore test if Cypress is running via Chrome
 // This test is not recorded to the Cypress Dashboard
-it('Show warning outside Chrome', (), {  browser: '!chrome' } => {
+it('Show warning outside Chrome', {  browser: '!chrome' }, () => {
   cy.get('.browser-warning')
     .should('contain', 'For optimal viewing, use Chrome browser')
 })

source/guides/guides/environment-variables.md

@@ -244,20 +244,20 @@ describe('test against Spanish site', {
 
 ```js
 // change environment variable for single test
-it('smoke test develop api', (), {
+it('smoke test develop api', {
   env: {
     api: 'https://dev.myapi.com'
   }
-} => {
+}, () => {
   cy.request(Cypress.env('api')).its('status').should('eq', 200)
 })
 
 // change environment variable for single test
-it('smoke test staging api', (), {
+it('smoke test staging api', {
   env: {
     api: 'https://staging.myapi.com'
   }
-} => {
+}, () => {
   cy.request(Cypress.env('api')).its('status').should('eq', 200)
 })
 ```