docs: fixes documentation oauth2 variable and updates old method (#205)
docs: fixes documentation oauth2 variable and updates old method (#205)

It seems that the documentation was declaring as OAuth2Provider the variable `oauth2Provider` whereas it used a non-declared variable `oauth2`. I renamed `oauth2` into the variable declared `oauth2Provider`.

Furthermore, on line 333, the IntrospectToken method was called without the TokenType argument. I added the fosite.AccessToken type.
ory/fosite,ory/fosite,ory-am/fosite,ory-am/fosite