man: Update dpkg-parsechangelog parser options

This got missed in commit d1629d0ec1b2619a1f2bd6839f975335e9cb6484.

The options specific to the changelog parser program did not get updated
when the parser got switched to be a perl module.

Closes: #848189

debian/changelog

@@ -9,6 +9,9 @@ dpkg (1.18.16) UNRELEASED; urgency=medium
     - Fix bogus description of --force-confmiss in dpkg(1). Regression
       introduced in 1.16.4. Reported by Sven Joachim <svenjoac@gmx.de>.
       Closes: #846395
+    - Update dpkg-parsechangelog parser options. The options specific to
+      the changelog parser program did not get updated when the parser got
+      switched to be a perl module. Missed in dpkg 1.18.8.
 
   [ Updated scripts translations ]
   * German (Helge Kreutzmann).

man/dpkg-parsechangelog.man

@@ -36,7 +36,7 @@ form.
 .
 .SH OPTIONS
 .TP
-.BR \-l " \fIchangelog-file\fP"
+.BR \-l ", " \-\-file " \fIchangelog-file\fP"
 Specifies the changelog file to read information from.
 A ‘\-’ can be used to specify reading from standard input.
 The default is
@@ -67,14 +67,6 @@ The following options can be used to influence the output of
 the changelog parser, e.g. the range of entries or the format
 of the output.
 .TP
-.BI \-\-file " file"
-Set the changelog filename to parse.
-Default is ‘-’ (standard input).
-.TP
-.BR \-l ", " \-\-label " \fIfile\fP"
-Set the name of the changelog file to use in error messages, instead
-of using the name from the \fB\-\-file\fP option, or its default value.
-.TP
 .BI \-\-format " output-format"
 Set the output format. Currently supported values are
 .BR dpkg " and " rfc822 .