Update ignoring-files.md

[bphermansson]

Clarified that a successful "touch .gitignore" gives no output.

Why:

Closes #11077

What's being changed:

Check off the following:

• I have reviewed my changes in staging (look for the latest deployment event in your pull request's timeline, then click View deployment).
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  • 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")

[welcome]

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[ramyaparimi]

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

[lecoursen]

Thanks @bphermansson! I'm going to apply a small change and then mark this as ready to merge. The repo is currently frozen, but we'll merge as soon as we can after that's over.

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