[Openid-specs-ab] Issue #1373: Definition of the Entity Statement (openid/connect)

[Kristina Yasuda]

New issue 1373: Definition of the Entity Statement
https://bitbucket.org/openid/connect/issues/1373/definition-of-the-entity-statement

Kristina Yasuda:

It might be a little more helpful for the reader if the definition of the Entity Statement was a little more descriptive .

> Entity statement
>
> An entity statement is issued by an entity, which pertains to a subject entity and leaf entities. An entity statement is always a signed JWT.

Suggest something like below:

> A JWT that contains XXX information. It is issued by an entity, which pertains to a subject entity and leaf entities.

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