gh-142533: Remove vulnerability warnings from wsgiref module documentation since the issue was recently fixed

Author: tadejmagajna

Doc/library/wsgiref.rst

@@ -265,7 +265,6 @@ manipulation of WSGI response headers using a mapping-like interface.
 
          Content-Disposition: attachment; filename="bud.gif"
 
-      This method does not reject input containing CRLF sequences.
 
    .. versionchanged:: 3.5
       *headers* parameter is optional.
@@ -900,12 +899,3 @@ directory and port number (default: 8000) on the command line::
             httpd.server_close()
 
 
-.. _wsgiref-security:
-
-Security considerations
------------------------
-
-The :class:`wsgiref.headers.Headers` class assumes sanitized input for header
-names and values and does not perform input validation such as checking for the
-presence of CRLF sequences. Untrusted input may result in CRLF injection
-attacks.