Revise intro to clarify it only applies to organization members

[jsoref]

Why:

• Closes: Publicizing or hiding organization membership doesn't mention that sometimes you can't #42696

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

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
account-and-profile/how-tos/organization-membership/publicizing-or-hiding-organization-membership.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 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]

@jsoref Thanks! I'll get this added to the merge queue!

[jsoref]

@Sharra-writes the outage kicked this out of the merge queue?

[Sharra-writes]

@jsoref I think so. Sometimes the checks also don't like edits to frontmatter in this repo, but I don't think it's that since everything passed earlier and it says something about a 500 error.

[jsoref]

Can you requeue it or something? (or is it best to just wait for the outage to go away and then requeue it?)

[Sharra-writes]

I'm running the test again to see if it works, and if it still doesn't I'll wait until the outage is over and try again.

[github-actions]

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