Update managing-labels.md

[dlheide]

Clarifying that labels are unique to a repo.

Why:

Closes: main...dlheide:docs:patch-1

What's being changed (if available, include any code snippets, screenshots, or gifs):

This page suggests that labels are unique to a repo. Empirical tests seem to support this. Adding text to clarify this.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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Source	Review	Production	What Changed
issues/using-labels-and-milestones-to-track-work/managing-labels.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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[Sharra-writes]

@dlheide This seems like a valid addition, and I think you've put it in a good place. I'll get it merged once checks are passing.

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