Enable documentation comment validation in swift-format

[czechboy0]

(This is about the codebase of the generator, runtime, and transports, not about generated code.)

We should enable the following two rules in the .swift-format file of all our repos, to get more validation of documentation comments. I sometimes forget to rename properties in doc comments and this could help catch that. Plus it'll ensure that new code is documented properly.

• ValidateDocumentationComments
• AllPublicDeclarationsHaveDocumentation
• possibly other comments-related ones

[PARAIPAN9]

Would like to take this one if it's available

[czechboy0]

Yeah, go ahead!