Change awkward phrasing in automatically-merging-a-pull-request.md

[InSyncWithFoo]

Full diff:

-Auto-merge prevents you from waiting around for requirements to be met
+Auto-merge helps you avoid waiting around for requirements to be met

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Source	Review	Production	What Changed
pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/automatically-merging-a-pull-request.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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