fix: correct grammar in custom properties documentation

[JUSTSUJAY]

What's being changed:

Fixed a small grammar mistake in the "Managing custom properties for repositories in your organization" documentation.
Changed:

"Custom properties on public repositories can viewed by anyone"
to
"Custom properties on public repositories can be viewed by anyone"

This improves clarity and correctness.

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Pull Request Overview

This PR fixes a minor grammar error in the documentation for managing custom properties on repositories.

• Fixed a missing "be" in the sentence regarding public repository visibility.

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Source	Review	Production	What Changed
organizations/managing-organization-settings/managing-custom-properties-for-repositories-in-your-organization.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.16 3.15 3.14 3.13

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

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[Sharra-writes]

@JUSTSUJAY Looks great! I'll get this added to the merge queue. Thanks for the help! 💛

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