Added the Comments API docs

[sebasslash]

Adding documentations for the comments API. Support for the comments API will be added to go-tfe and thus go-tfe's docs need to be able to reference a API documentation page that exists.

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[annawinkler]

Where would we find a Terraform Enterprise comment? I'm wondering if more description of what a comment is might be helpful here. What do you think?

[laurapacilio]

I 100% agree with this! Can we provide a more detailed descriptions of what comments are? Also - is this NOT relevant to terraform cloud? If so, I think we should explicitly say that here. If it IS relevant, then what does it look like in TFC? I just noted that we explicitly say "Terraform Enterprise" which makes me think it's not relevant to TFC

[annawinkler]

🥇 Thank you for adding the docs for this API! I have one question/comment that isn't a blocker.

[annawinkler]

💯 Looks good to me! Thank you.