Fix Behat feature file example verbiage. [ci skip]

Author: geerlingguy

docs/extras/selenium.md

@@ -60,7 +60,7 @@ Using the default Drupal site as an example (it's installed in `/var/www/drupalv
   3. From either inside the VM or on the host machine, open up the new `features/web` folder Behat just created. Inside _that_ folder, create `HomeContent.feature` with the following contents:
 
         Feature: Test DrupalContext
-          In order to prove the Behat is working correctly in Drupal VM
+          In order to prove Behat is working correctly in Drupal VM
           As a developer
           I need to run a simple interface test
 
@@ -75,7 +75,7 @@ If everything was done correctly, you should see:
 ```console
 $ behat
 Feature: Test DrupalContext
-  In order to prove the Behat is working correctly in Drupal VM
+  In order to prove Behat is working correctly in Drupal VM
   As a developer
   I need to run a simple interface test