[master] 58e30e74e changes: Mention builtin pipe changes

[Walid Boudebouda]

commit 58e30e74ed511726f5c55f6f00fc9fb38120b3b0
Author: Walid Boudebouda <walid.boudebouda at gmail.com>
Date:   Mon Aug 18 11:49:00 2025 +0200

    changes: Mention builtin pipe changes

diff --git a/doc/changes.rst b/doc/changes.rst
index 9c0f23f47..d356b523b 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -41,6 +41,10 @@ Varnish Cache NEXT (8.0, 2025-09-15)
 .. PLEASE keep this roughly in commit order as shown by git-log / tig
    (new to old)
 
+* ``builtin.vcl`` has been updated to return a synthetic 501 response and
+  close the connection when receiving requests with an unknown/unsupported
+  http method instead of piping them.
+
 * The default value for ``ban_any_variant`` is now ``0``. This means that
   during a lookup, only the matching variants of an object will be evaluated
   against the ban list.