docs: Remove redundant "apps"

[kwentine]

Remove redundant "apps" word.

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Source	Review	Production	What Changed
organizations/managing-oauth-access-to-your-organizations-data/about-oauth-app-access-restrictions.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

@kwentine Thanks for the fix! I've got this added to the merge queue.

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