Enable documentation comment validation in swift-format

[PARAIPAN9]

Motivation

• Relates to https://github.com/apple/swift-openapi-generator/issues/165

Modifications

• Enable new rules in swift-format and address changes required

Result

• New swift format rules will be implemented

Test Plan

• Run the tests

[czechboy0]

@swift-server-bot add to allowlist

[PARAIPAN9]

You're welcome! I'm glad I could contribute.