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Small consistency addition for installation.md

Update merge requests from fork project to origin project

Fix error described in https://github.com/gitlabhq/gitlabhq/issues/5185

Signed-off-by: Islam Amer <islam.amer@jollamobile.com>

Because notes scope was not limited by project in
MergeRequest#mr_and_commit_notes it causes comments from project A
appears in discussions for MR in project B.