OAuth should be replaced by OAuth 2.0 or OAuth 2.*

[bertocco]

OAuth (Open Authorization) is an open standard for access delegation.
Because OAuth 2.0 is not backwards compatible with OAuth 1.0 and
OAuth 2.1 is an in-progress effort to consolidate and simplify the most commonly used features of OAuth 2.0,
the string OAuth should be replaced with OAuth 2.0 or (OAuth 2.*), to be more precise.