Correct typos in web_hooks help.

doc/web_hooks/web_hooks.md

-Project web hooks allow you to trihher an url if new code is pushed or a new issue is created.
+Project web hooks allow you to trigger an URL if new code is pushed or a new issue is created.
 
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 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.
+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.
 
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 #### Push events
+
 Triggered when you push to the repository except pushing tags.
 
 **Request body:**