Complete jwt documentation

[johachi]

Description

• Added documentation for jwt.decode_complete.
  I'm honestly unsure if everything needs to be duplicated or not since the only thing that is different to jwt.decode is the return value. I'm happy to just write Parameters: Sames as jwt.decode if that is preferred.

• I previously wrote (e.g.) verify_aud=True`` but will be ignored if ``verify_signature`` is ``False``. for all the options parameters except require and verify_signature, but that is a bad way of describing it.

  What I wanted to write was that the value is True by default, but will default to False if verify_signature is set to false. In other words, they default to the same value as verify_signature. I, therefore, think that a better way of writing this is verify_aud=verify_signature, and then move verify_signature=True to the top. This way, it is understandable that it is possible to set (e.g.) verify_aud=True and verify_signature=False.

• Added a warning regarding exp, iat and nbf only being verified if present.

Screenshot (Firefox Developers Edition 89.0b5)

[jpadilla]

✨ thanks!