Updates repo topics URL for GHES docs

[IAmHughes]

Why:

GHES users shouldn't be pointed to the URL for GitHub.com topics. They should be pointed to their instance's topics list instead.

Closes: #34006

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

I've updated the documentation to continue to link to the GitHub.com URL when on GHEC or FPT, but when on GHES it will display https://HOSTNAME/topics following the same nomenclature used in other documentation for GHES such as about remote repositories

Old

New

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[github-actions]

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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
repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/classifying-your-repository-with-topics.md	fpt ghec ghes@ 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.13 3.12 3.11 3.10

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

[nguyenalex836]

@IAmHughes Thanks so much for opening a PR! I'll get this triaged for review ✨

[lecoursen]

Thanks @IAmHughes, very cool to see you again! 💖 I'm going to apply a small suggestion and then merge. ⚡

[github-actions]

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