Remove "Brave" in "Show Brave suggested sites in autocomplete suggestions" description

[Tonev]

This commit removes "Brave" in "Show Brave suggested sites in autocomplete suggestions" description.

Resolves brave/brave-browser#16797

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[Tonev]

Asking for assistance for review/merge whenever appropriate.

@stephendonner @bbondy @bsclifton

[bsclifton]

cc: @mkarolin - I think this file (or at least this part of the file) is auto-generated. It might need to be replaced in another spot

[mkarolin]

@bsclifton this one is all ours. Comes from https://github.com/brave/brave-core/pull/5438/files#diff-6314ab9f5910c0e3dd53f8ac6bf09b584020abe6790abe7ebcdacc5756c5d5f9R273-R275

[mkarolin]

LGTM

[Tonev]

Thank you, @bsclifton and @mkarolin! Please, remember to merge as well when you decide the time is appropriate!