docs: clarify subject-case [resolves #3638]

[olets]

Description

resolves #3638

1. subject-case uses the standard condition language
2. subject-case "possible values" to use // lower case instead of // default

Motivation and Context

• docs: clarify subject-case #3638

Usage examples

N/A

How Has This Been Tested?

• It hasn't. See fix: document a low-friction way to run tests to satisfy PR template checklist item #3639

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)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
  • I didn't run the tests, after hitting fix: document a low-friction way to run tests to satisfy PR template checklist item #3639. Does not change anything that would affect tests.

[escapedcat]

Didn't check the details now but is the "default" info somehow relevant if you use this rule without a specific value?

[olets]

@escapedcat as far as I've seen, no. In config-angular (link) and config-conventional (link) the default value is

['sentence-case', 'start-case', 'pascal-case', 'upper-case']

as already correctly documented at docs/reference-rules.md:286

[escapedcat]

Thanks

[matz3]

But isn't the rule incorrect in the docs? It's always but in the code it's never