man: Fix deb-changes(5) description to talk about .changes instead of .dsc

Reported-by: HW42 <hw42@ipsumj.de>

debian/changelog

@@ -3,6 +3,8 @@ dpkg (1.18.10) UNRELEASED; urgency=medium
   [ Guillem Jover ]
   * Documentation:
     - Document Testsuite-Triggers in dsc(5).
+    - Fix deb-changes(5) description to talk about .changes instead of .dsc.
+      Reported by HW42 <hw42@ipsumj.de>.
 
   [ Updated scripts translations ]
   * German (Helge Kreutzmann).

man/deb-changes.5

@@ -25,7 +25,7 @@ deb\-changes \- Debian changes file format
 .IB filename .changes
 .
 .SH DESCRIPTION
-Each Debian source package is composed of a .dsc control file, which
+Each Debian upload is composed of a .changes control file, which
 contains a number of fields.
 Each field begins with a tag, such as
 .B Source