Added little qualifier to the Note Bene.

Edited kbucket to make "key_in_range" docs show what is being
returned.

Fixed kbucket typo.
Tried to make things more concistant (capitals, and
k/v => key/value)
Update validators.py

id -> ID
Changed wording slightly to make clearer.

Removed some speicis from a paragraph that were not relevant to
this function. Copy and paste mistake?

Also you seem prefer using this 'x' field format of talking about
the different fields. Changed to be consistent.
Update utils.py

id => ID