Clarified that permanent links can include column ranges

[sujooy17]

Added a clarification note explaining that users can create permanent links to specific columns within a line, and that column-level links may not work in all browsers. Fixes issue #40794.

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Closes:

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

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Source	Review	Production	What Changed
get-started/writing-on-github/working-with-advanced-formatting/creating-a-permanent-link-to-a-code-snippet.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 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]

@sujooy17 After talking with the team, we aren't going to document this feature because it isn't officially supported and is too much of an edge case. I'm sorry.