dpkg(1): clarify scope of --configure

Robert Persson pointed out in
https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/77287 that
describing --configure as "Reconfigure an unpacked package" is simply
wrong.  This patch clarifies its behaviour, and adds a helpful pointer
to dpkg-reconfigure(8) (there's already one in the SEE ALSO section) for
those who really want that instead.

debian/changelog

@@ -11,6 +11,9 @@ dpkg (1.15.8) UNRELEASED; urgency=low
   * Fix some copy-paste mistakes in dpkg-architecture(1). Thanks to Ian Fleming
     <iflema@yahoo.com.au> for the patch and Colin Watson for forwarding out of
     Launchpad. Closes: #582404 LP: #564308
+  * Clarify description of dpkg --configure in dpkg(1). Thanks to Colin Watson
+    for the patch and to Robert Persson for the report.
+    Closes: #582406 LP: #77287
 
   [ Guillem Jover ]
   * Require gettext 0.18:

man/dpkg.1

@@ -134,9 +134,13 @@ Unpack the package, but don't configure it. If \fB\-\-recursive\fP or
 directory instead.
 .TP
 \fB\-\-configure \fP\fIpackage\fP...|\fB\-a\fP|\fB\-\-pending\fP
-Reconfigure an unpacked package. If \fB\-a\fP or \fB\-\-pending\fP is
-given instead of \fIpackage\fP, all unpacked but unconfigured
-packages are configured.
+Configure a package which has been unpacked but not yet configured.
+If \fB\-a\fP or \fB\-\-pending\fP is given instead of \fIpackage\fP,
+all unpacked but unconfigured packages are configured.
+
+To reconfigure a package which has already been configured, try the
+.BR dpkg\-reconfigure (8)
+command instead.
 
 Configuring consists of the following steps:
 .br