* build-aux/sync-synopses.scm: Rename to...
* build-aux/sync-descriptions.scm: ... this. Compare the value of
'gnu-package-doc-description' and 'package-description' and report any
mismatch.
* Makefile.am (EXTRA_DIST): Adjust accordingly.
(sync-synopses): Rename to...
(sync-descriptions): ... this.
