Improve text wording; fix wrong link URL

“Too afraid” is correct, but unnecessary; “afraid” is shorter and means the same thing here.

Why use “Note:” instead of “Notice:”: “You want readers to pay particular attention to the point (one sense of note) rather than merely be aware of it. Note also makes more sense as an active exhortation.” – http://english.stackexchange.com/a/100554/22349

other changes speak for themselves
Merge pull request #1 from roryokane/patch-1

Improve text wording; fix wrong link URL