remove PR-related paragrapg from REC

@msporny I also took the liberty of applying this change directly
on the version hosted on w3.org/TR ,
as I notived this paragraph was not on the REC dated 2022-06-30.

I don't know why/how it popped back...

REC/2022-07-19/index.html

@@ -596,12 +596,6 @@ <h1 id="title" class="title">Decentralized Identifiers (DIDs) v1.0</h1> <h2 id="
       in the <a href="https://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at
       https://www.w3.org/TR/.</em></p>
 
-    <p>
-The <abbr title="World Wide Web Consortium">W3C</abbr> Decentralized Identifier Working Group has published this document as a
-<abbr title="World Wide Web Consortium">W3C</abbr> Proposed Recommendation and is requesting that interested parties
-review this specification by August 26th, 2021.
-    </p>
-
     <p>
 At the time of publication, there existed
 <a href="https://w3c.github.io/did-spec-registries/#did-methods">103