dpkg-source(1): small improvement

Give the section name listing source packages formats when we're
referring to it. Thanks to Jari Aalto for the idea.

debian/changelog

@@ -87,6 +87,8 @@ dpkg (1.15.4) UNRELEASED; urgency=low
   * Improve performance of dpkg-shlibdeps by caching minimal version
     associated to each library in Dpkg::Shlib::SymbolFile. Thanks to
     Jiří Paleček <jpalecek@web.de> for the patch.
+  * Slightly improve dpkg-source(1) by giving the section name that we're
+    referring to. Closes: #544037
 
   [ Modestas Vainius ]
   * Provide a meaningful label for dpkg-gensymbols diff.

man/dpkg-source.1

@@ -59,8 +59,8 @@ additional parameters might be accepted.
 that works from this ordered list:
 the format(s) indicated with the \fI\-\-format\fP command-line option(s),
 the format indicated in \fBdebian/source/format\fP,
-"1.0", "3.0 (native)". See below for an extensive description of
-various source package formats.
+"1.0", "3.0 (native)". See section \fBSOURCE PACKAGE FORMATS\fP for an
+extensive description of the various source package formats.
 
 .TP
 .BR \-h ", " \-\-help