Update http.markdown

[liveinjs]

response.finished

[Nodejs-Jenkins]

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Commit liveinjs/node@fb94876 has the following error(s):

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[jasnell]

Hmm... unfortunately it doesn't look like this one was ever reviewed. @liveinjs , thank you for submitting this, sorry it's taken so long for someone to look at it. There are a couple of grammatical issues that should be addressed before it's landed tho; and we should verify that the finished property is meant to be part of the API. @cjihrig @trevnorris ... does this look fine to you?

[cjihrig]

I'm not 100% sure. Given that it's not underscored, it seems like it should be documented. If we want to document it, this needs a bit of cleanup.

[trevnorris]

Agree w/ @cjihrig

[jasnell]

New cleaned up PR opened. Closing this here.