man: Document in deb822(5) that deb-origin(5) also supports comments

Prompted-by: Ben Finney <ben@benfinney.id.au>

debian/changelog

@@ -130,6 +130,7 @@ dpkg (1.18.5) UNRELEASED; urgency=medium
     - Move SEE ALSO section to the end of Dpkg::Changelog::Debian.
     - Clarify that i386 does not suffer performance loss due to PIE anymore
       since gcc >= 5 in dpkg-buildflags(1).
+    - Document in deb822(5) that deb-origin(5) also supports comments.
 
   [ Updated programs translations ]
   * Dutch (Frans Spiesschaert). Closes: #822797

man/deb822.5

@@ -118,7 +118,7 @@ space followed by a dot.
 
 Lines starting with \(oq\fB#\fP\(cq without any preceding whitespace are
 comments lines that are only permitted in source package control files
-\fIdebian/control\fP).
+(\fIdebian/control\fP) and in \fBdeb\-origin\fP(5) files.
 These comment lines are ignored, even between two continuation lines.
 They do not end logical lines.