[Openid-specs-fapi] Issue #651: Avoid "should be" and "shall be" where possible (openid/fapi)

[Nat]

New issue 651: Avoid "should be" and "shall be" where possible
https://bitbucket.org/openid/fapi/issues/651/avoid-should-be-and-shall-be-where

Nat Sakimura:

It makes it unclear who is responsible for it. 

There are two instances of “should be” and four relevant instances of “shall be”. 

One on 5.7.3 reads a bit weird as well. It goes: 

> In addition, this profile
>
> 1\. requires that jwks\_uri endpoints shall be served over TLS;

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