Registration - 2.1 incorrect userinfo_signed_response_algs definition

[Edmund Jay]

Currently it's written as

{{{ OPTIONAL. The JWS [JWS] encryption algorithm required for UserInfo responses. If this is specified the response will be JWT [JWT] serialized. }}}

Encryption should be changed to signature or cryptographic.

[Michael Jones]

"encryption" should become "signature"

[John Bradley]

Fixes #506 Fixed Sec 2.1 userinfo_signed_response_algs fixed to say signature. Clarify response is signed. Fixed Sec 2.1 userinfo_encrypted_response_algs Clarify response is JWE containing JWT.

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