[Openid-specs-ab] Issue #1321: Clarified DID fields (openid/connect)

[Edmund Jay]

New issue 1321: Clarified DID fields
https://bitbucket.org/openid/connect/issues/1321/clarified-did-fields

Edmund Jay:

Comments from PD regarding for [pull request #39](https://bitbucket.org/openid/connect/pull-requests/39/merging-cp-into-ca)

[https://bitbucket.org/openid/connect/pull-requests/39/merging-cp-into-ca#comment-237220247](https://bitbucket.org/openid/connect/pull-requests/39/merging-cp-into-ca#comment-237220247)

There appear to be two did fields identified in this spec - one in the object, and one in the authorization request query parameter. Suggest we make it very clear whether the steps in this section apply to one, the other, or both.

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