Basic - 3.3 wording for id_token - client binding

[Former user]

Section 3.3 says:

"The id_token is scoped to a particular client via the audience and nonce."

In order to avoid confusion with the semantics of the "scope" parameter, "issued to a particular client" (or associated?) are probably better.

[Nat Sakimura]

Change to

The id_token is audience restricted to a particular client via the audience and nonce.

[Edmund Jay]

fixes #75

→ 277b9113b4ee