Update recaptcha docs for clarity

* Specified that reCAPTCHA v2 keys must be used
* Updated the URL for application settings
* Some small rewording

doc/integration/recaptcha.md

@@ -9,9 +9,9 @@ to confirm that a real user, not a bot, is attempting to create an account.
 To use reCAPTCHA, first you must create a site and private key.
 
 1. Go to the URL: <https://www.google.com/recaptcha/admin>.
-1. Fill out the form necessary to obtain reCAPTCHA keys.
-1. Login to your GitLab server, with administrator credentials.
-1. Go to Applications Settings on Admin Area (`admin/application_settings`).
+1. Fill out the form necessary to obtain reCAPTCHA v2 keys.
+1. Log in to your GitLab server, with administrator credentials.
+1. Go to Reporting Applications Settings in the Admin Area (`admin/application_settings/reporting`).
 1. Fill all recaptcha fields with keys from previous steps.
 1. Check the `Enable reCAPTCHA` checkbox.
 1. Save the configuration.