Minor grammatical errors in new forms API documentation

I've found a couple of minor typos on the following page:

http://drupaldocs.org/api/head/file/contributions/docs/developer/topics/...

Specifically, the word "it's" (with apostrophe) is used in several places where "its" should be used. I know it's a picky little thing, but as a professional writer I unfortunately am doomed to notice such things. When used as a possessive, "its" is correct. "It's" is used only as a contraction of "it is", "it was", "it has", and so on.

Other than this minor typo, though, this is an extremely helpful section of the documentation, and I commend the authors and editors.

Scott