docs: fixing rules.md

[Naedri]

• fixing typo of example from subject-case rule

• Description

From '.' to ','

Motivation and Context

other example ended with ','

Usage examples

Not related

How Has This Been Tested?

Just documentation

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

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[escapedcat]

Thanks!

[escapedcat]

Prettier is failing, could you try to run yarn format-fix?

[knocte]

I don't understand why prettier is changing .md files?

[escapedcat]

@knocte the setup was always formatting md files as well I think. If that's what you wanted to know.