Doc and style changes

[k-doering-NOAA]

Partially addresses #136 and #137 by:

• Adding examples that illustrate options for the doc and style workflow
• Adding an error message for having doc and style run on pull requests and submit a pull request, since @iantaylor-NOAA found this combo to not work.

Additionally, this corrects outdated documentation suggesting that the rm_dollar_sign function was in the {r4ss} pkg; it is in {ghactions4r}.

@iantaylor-NOAA , I thought you would be best to review this, but perhaps @Bai-Li-NOAA can review if you are not able to!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.02%. Comparing base (2695d1a) to head (b4df853).

Files	Patch %	Lines
R/use_r_workflows.R	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #138 +/- ## ========================================== - Coverage 95.47% 95.02% -0.46% ========================================== Files 3 3 Lines 199 201 +2 ========================================== + Hits 190 191 +1 - Misses 9 10 +1 ```

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[k-doering-NOAA]

Thanks for reviewing @iantaylor-NOAA !

@Bai-Li-NOAA will be maintaining ghactions4r over the next few months :)