doc: remove obsolete cc recommendations

In 2016, Ali added the instruction to cc him on particular V8 bugs and the suggestion to contact him for certain problems. However, I'm pretty sure Ali has not been working on V8 for 2+ years at this point. I'm guessing those instructions are obsolete at this point. (I'll ping him in the PR for this change to confirm, though.)

Also: Remove a parenthetical and add a comma, because I can't imagine opening a separate pull request to add a comma. (OK, I'm lying, I totally can and if anyone has done that in the past, it's probably me.)