Trim down the non-spec verbiage.

Author: ashnazg

proposed/phpdoc.md

@@ -23,21 +23,7 @@ PSR-5: PHPDoc
 
 ## 1. Introduction
 
-The main purpose of this PSR is to provide a complete and formal definition of
-the PHPDoc standard. This PSR deviates from its predecessor, the de-facto PHPDoc
-Standard associated with [phpDocumentor 1.x][PHPDOC.ORG], to provide
-support for newer features in the PHP language and to address some of the
-shortcomings of its predecessor.
-
-This document SHALL NOT:
-
-* Describe a standard for implementing annotations via PHPDoc. Although it does
-  offer versatility which makes it possible to create a subsequent PSR based on
-  current practices. See [chapter 5.3](#53-tags) for more information on this
-  topic.
-* Describe best practices or recommendations for Coding Standards on the
-  application of the PHPDoc standard. This document is limited to a formal
-  specification of syntax and intention.
+The purpose of the PSR is to provide a formal definition of the PHPDoc standard.
 
 ## 2. Conventions Used In This Document