Merge branch 'fix-grammar-help-webhooks' into 'master'

Fix grammar and typos in Webhooks help

This MR gets rid of some typos and wrong grammar in [help/web_hooks](https://gitlab.com/help/web_hooks).

doc/web_hooks/web_hooks.md

@@ -2,16 +2,16 @@ Project web hooks allow you to trigger an URL if new code is pushed or a new iss
 
 ---
 
-You can configure web hook to listen for specific events like pushes, issues, merge requests.
-GitLab will send POST request with data to web hook URL.
-Web Hooks can be used to update an external issue tracker, trigger CI builds, update a backup mirror, or even deploy to your production server.
+You can configure web hooks to listen for specific events like pushes, issues or merge requests.
+GitLab will send a POST request with data to the web hook URL.
+Web hooks can be used to update an external issue tracker, trigger CI builds, update a backup mirror, or even deploy to your production server.
 If you send a web hook to an SSL endpoint [the certificate will not be verified](https://gitlab.com/gitlab-org/gitlab-ce/blob/ccd617e58ea71c42b6b073e692447d0fe3c00be6/app/models/web_hook.rb#L35) since many people use self-signed certificates.
 
 ---
 
 #### Push events
 
-Triggered when you push to the repository except pushing tags.
+Triggered when you push to the repository except when pushing tags.
 
 **Request body:**
 
@@ -84,7 +84,7 @@ Triggered when a new issue is created or an existing issue was updated/closed/re
 
 #### Merge request events
 
-Triggered when a new merge request is created or an existing merge request was updated/merges/closed.
+Triggered when a new merge request is created or an existing merge request was updated/merged/closed.
 
 **Request body:**