doc: Fix typos for --predep-package option name

Closes: #794688
Reported-by: Sven Joachim <svenjoac@gmx.de>

debian/changelog

@@ -9,6 +9,8 @@ dpkg (1.18.3) UNRELEASED; urgency=low
     - Get the reference build flags from dpkg-buildflags.pl, instead of
       hardcoding them, which might not match depending on the architecture.
       Closes: #794694
+  * Documentation:
+    - Fix typos for --predep-package option name. Closes: #794688
 
   [ Updated programs translations ]
   * Catalan (Jordi Mallach).
@@ -99,7 +101,7 @@ dpkg (1.18.2) unstable; urgency=low
     - Use the feature area name in the dpkg-buildflags(1) subsection title.
     - Document DPKG_HOOK_ACTION also in dpkg(1) ENVIRONMENT section.
     - Clarify when some features where added in man pages.
-    - Document --yet-to-unpack, --predep-packages and all --assert-<feature>
+    - Document --yet-to-unpack, --predep-package and all --assert-<feature>
       commands as supported in both «dpkg --help» and dpkg(1).
     - Document abitable in dpkg-architecture(1).
     - Clarify that an architecture wildcard is a Debian thing in

man/dpkg.1

@@ -308,7 +308,7 @@ to deinstall any packages not in list given to \fB\-\-set\-selections\fP.
 Searches for packages selected for installation, but which for some
 reason still haven't been installed.
 .TP
-.B \-\-predep\-packages
+.B \-\-predep\-package
 Print a single package which is the target of one or more relevant
 pre-dependencies and has itself no unsatisfied pre-dependencies.
 .IP

man/po/de.po

@@ -17,7 +17,7 @@ msgstr ""
 "Project-Id-Version: dpkg-man 1.18.2\n"
 "Report-Msgid-Bugs-To: debian-dpkg@lists.debian.org\n"
 "POT-Creation-Date: 2015-08-04 20:59+0200\n"
-"PO-Revision-Date: 2015-08-04 21:54+0200\n"
+"PO-Revision-Date: 2015-08-06 02:09+0200\n"
 "Last-Translator: Helge Kreutzmann <debian@helgefjell.de>\n"
 "Language-Team: German <debian-l10n-german@lists.debian.org>\n"
 "Language: de\n"
@@ -4247,8 +4247,8 @@ msgstr ""
 #. type: TP
 #: dpkg.1
 #, no-wrap
-msgid "B<--predep-packages>"
-msgstr "B<--predep-packages>"
+msgid "B<--predep-package>"
+msgstr "B<--predep-package>"
 
 # FIXME english
 #. type: Plain text

src/main.c

@@ -105,7 +105,7 @@ usage(const struct cmdinfo *ci, const char *value)
 "  -S|--search <pattern> ...        Find package(s) owning file(s).\n"
 "  -C|--audit [<package> ...]       Check for broken package(s).\n"
 "  --yet-to-unpack                  Print packages selected for installation.\n"
-"  --predep-packages                Print pre-dependencies to unpack.\n"
+"  --predep-package                 Print pre-dependencies to unpack.\n"
 "  --add-architecture <arch>        Add <arch> to the list of architectures.\n"
 "  --remove-architecture <arch>     Remove <arch> from the list of architectures.\n"
 "  --print-architecture             Print dpkg architecture.\n"