solving issues#20289 - part 1/2 - adding a sentence as requested

[CapitainFlam]

Why:

Closes [https://github.com//issues/20289]

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

According to UI product feedback, I added a sentence at the end.

Check off the following:

• 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).
• 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")

[github-actions]

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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/working-with-advanced-formatting/attaching-files.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

[felicitymay]

@CapitainFlam - thank you for taking the time to submit this update to fix issue #20289 ✨

I've updated your wording so that it's suitable for all our products and moved the new text above the list of maximum file sizes so that it's easier to see. I will merge your change once the tests pass.

[github-actions]

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