fix cli example with project and spec options (cypress-io#5574)

Author: MikeMcC399

docs/guides/guides/command-line.mdx

@@ -438,15 +438,15 @@ app/
     unit/
     e2e/
       cypress/
-        integration/
-          spec.js
+        e2e/
+          spec.cy.js
       cypress.config.js
 ```
 
 If we are in the `app` folder, we can run the specs using the following command
 
 ```shell
-cypress run --project tests/e2e --spec ./tests/e2e/cypress/e2e/spec.js
+cypress run --project tests/e2e --spec ./tests/e2e/cypress/e2e/spec.cy.js
 ```
 
 #### `cypress run --tag <tag>` {#cypress-run-tag-lt-tag-gt}