Standard 2.3.2, 5.2.1, etc. Validation rules should be in Messages, not Standard

[Michael Jones]

We reached the conclusion that the validation rules in Standard, such as 2.3.2. (Authorization Server Validates Request Object) and 5.2.1 (Response Verification) should be in Messages. There should be no references from Messages to Standard.

[Nat Sakimura]

Re #387

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[Nat Sakimura]

re #387

→ bb464fe7c519

[Nat Sakimura]

re #387

→ 01da5e36a4df

[Nat Sakimura]

re #387

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[Nat Sakimura]

This itself is fixed. However, I feel that the validation rules should be spelled out more precisely.