document "symbols" in object_name_linter (#1924)

[hedsnz]

Resolves #1924 by adding a short description of the "symbols" style in the object_name_linter documentation.

[codecov-commenter]

Codecov Report

Merging #2001 (6d67158) into main (ba896ef) will not change coverage.
The diff coverage is n/a.

❗ Current head 6d67158 differs from pull request most recent head 46d7163. Consider uploading reports for the commit 46d7163 to get more accurate results

@@           Coverage Diff           @@
##             main    #2001   +/-   ##
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  Coverage   98.56%   98.56%           
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  Files         113      113           
  Lines        5003     5003           
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  Hits         4931     4931           
  Misses         72       72           

Impacted Files	Coverage Δ
R/object_name_linter.R	98.18% <ø> (ø)

[MichaelChirico]

Thanks for your patience -- a long review for a seemingly minor change :)

But it's important to get user-facing docs as nice as possible, IMO.

Please also credit yourself in the NEWS! I think this would be most appropriate in the Notes section.

[hedsnz]

I'm very much in agreement :)

Thanks!

edit -- I'm assuming you will squash commits via the pull request and don't need me to force push a squashed history?