Fix auto DOI opt out instruction typo and make it bold

[kathy-t]

Description
This PR fixes the typo in the auto DOI generation opt out instruction for GitHub App entries. This PR also bolds that instruction to make it more prominent and specifies that an author is required.

Before:

After:

Review Instructions
See #2059

Issue
https://ucsc-cgl.atlassian.net/browse/SEAB-6807

Security
If there are any concerns that require extra attention from the security team, highlight them here.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.81%. Comparing base (afe3bd7) to head (e4e94a0).
Report is 1 commits behind head on hotfix/2.13.5.

Additional details and impacted files

@@              Coverage Diff               @@
##           hotfix/2.13.5    #2064   +/-   ##
==============================================
  Coverage          41.81%   41.81%           
==============================================
  Files                394      394           
  Lines              12330    12330           
  Branches            2960     2960           
==============================================
  Hits                5156     5156           
  Misses              4854     4854           
  Partials            2320     2320           

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[svonworl]

Whilst testing, I got tripped up by the "at least one author" requirement, which I wasn't aware of (not sure if I'd ever known or just forgotten). So, maybe we can ad some text that alludes to it here, something like "and has information about at least one author".

[kathy-t]

Added that at least one author is required. Screenshots are updated in the PR description

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud