Update search result description for secret gists

[gregdeane]

Why:

The documentation is not clear regarding secret gists appearing in search results.

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

Added clarification regarding search results and secret gists. Secret gists do appear in the search results for the person who created them (if they are logged in).

A secret gist

The secret gist above appears in search results when I am logged in.

Check off the following:

• [x] I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• [x] For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• [ ] This pull request impacts the contribution experience
  • [ ] I have added the 'writer impact' label
  • [ ] I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

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Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
get-started/writing-on-github/editing-and-sharing-content-with-gists/creating-gists.md	fpt ghec ghes@ 3.6 3.5 3.4 3.3 3.2 ghae	fpt ghec ghes@ 3.6 3.5 3.4 3.3 3.2 ghae

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fpt: Free, Pro, Team ghec: GitHub Enterprise Cloud ghes: GitHub Enterprise Server ghae: GitHub AE

[cmwilson21]

@gregdeane Thanks so much for opening a PR! I'll get this triaged for review :zap:

[gregdeane]

@skedwards88 Great update! Much better now. Thank you.

[github-actions[bot]]

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