Fix some "specific" typos

[jtraglia]

This PR fixes a minor typo in some of the comments.

• "specifc" -> "specific"

Also, add punctuation to a couple of docstring comments for consistency.

[dot-asm]

How do you know it's specifically not a watermark? I'm just kidding of course :-) :-) :-) Thanks! I'll apply it at a next occasion...

[dot-asm]

Thanks!