removed redundant word

What does this MR do?

fixed a redundant requests in file merge_requests.md

doc/workflow/merge_requests.md

@@ -53,7 +53,7 @@ It should look like this:
   fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
 ```
-Now you can fetch all the merge requests requests:
+Now you can fetch all the merge requests:
 ```
 $ git fetch origin