Code review comment for lp:~benji/launchpad/bug-753152

This is a good fix. As we discussed, it wasn't actually what I intended to bring up in bug 753152, but this direct subscription muting is a parallel problem, and worthy of explaining. The JS lint and innerHTML changes look nice too.

Approved, with the following changes:

 - Move lib/lp/bugs/help/structural-subscription-mute.html to lib/lp/bugs/help/subscription-mute.html or similar.
 - fix typo "abotu"
 - land as incremental fix for the bug (or new bug as you wish) and then make another branch to fix the structural subscription version of the bug.

Thank you,

Gary