Fixed broken permissions link.

doc/workflow/protected_branches.md

@@ -12,7 +12,7 @@ A protected branch does three simple things:
 
 You can make any branch a protected branch. GitLab makes the master branch a protected branch by default.
 
-To protect a branch, user needs to have at least a Master permission level, see [permissions document](permissions/permissions.md).
+To protect a branch, user needs to have at least a Master permission level, see [permissions document](doc/permissions/permissions.md).
 
 ![protected branches page](protected_branches/protected_branches1.png)
 
@@ -29,5 +29,3 @@ For those workflows, you can allow everyone with write access to push to a prote
 On already protected branches you can also allow developers to push to the repository by selecting the `Developers can push` check box.
 
 ![Developers can push](protected_branches/protected_branches2.png)
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