Address review feedback from #11269 (#11273)

Signed-off-by: Dan Callahan <danc@element.io>

changelog.d/11273.misc

+Clean up trivial aspects of the Debian package build tooling.

debian/changelog

@@ -2,11 +2,11 @@ matrix-synapse-py3 (1.47.0+nmu1) UNRELEASED; urgency=medium
 
   * Update scripts to pass Shellcheck lints.
   * Remove unused Vagrant scripts from debian/ directory.
-  * Change package Architecture to any.
+  * Allow building Debian packages for any architecture, not just amd64.
   * Preinstall the "wheel" package when building virtualenvs.
   * Do not error if /etc/default/matrix-synapse is missing.
 
- -- root <root@cae79a6e79d7>  Fri, 22 Oct 2021 22:20:31 +0000
+ -- Dan Callahan <danc@element.io>  Fri, 22 Oct 2021 22:20:31 +0000
 
 matrix-synapse-py3 (1.46.0) stable; urgency=medium