HEART UMA - 2.2.1 Refer to "RPT endpoint"

[jmandel]

http://openid.bitbucket.org/HEART/openid-heart-uma.html#rfc.section.2.1 says that an "aud" claim in the AAT specifies the "RPT authorization endpoint"; UMA refers to this as simply the "RPT endpoint", and I think the HEART profile's language should be consistent.

[Justin Richer]

rename endpoint reference, closes #1

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