Changed wording slightly to make clearer.
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
Update crypto.py

Paragraph specifics were not relevant to this function. Copy and paste mistake?

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

id => ID