Spell the resolution procedure as `[[Resolve]]`.

Per comments from @erights in #84, this makes it clearer that the procedure is an abstract specification device and not a real JavaScript function.
Fix typo.

Pointed out by @briancavalier at https://github.com/promises-aplus/promises-spec/commit/d08e9dd7bab25544aeb67f15a92e731dcbf49e2e#commitcomment-2902051.