man: Document in dpkg-statoverride the format to specify mode

Closes: #534551

debian/changelog

@@ -7,6 +7,8 @@ dpkg (1.15.3) UNRELEASED; urgency=low
   * Rewrite dpkg-name in perl.
   * Do not close already closed files in some error conditions in libdpkg.
   * Use the correct units (KiB) in dpkg-split when referring to partsize.
+  * Document in dpkg-statoverride(8) that mode needs to be specified in
+    octal. Closes: #534551
 
   [ Raphael Hertzog ]
   * Unset TAR_OPTIONS when creating/extracting tar archives for source

man/dpkg-statoverride.8

@@ -28,7 +28,8 @@ Add an override for \fBfile\fR. \fBfile\fR does not need to exist
 when this command is used; the override will be stored and used later.
 Users and groups can be specified by their name (for example \fBroot\fR
 or \fBnobody\fR), or by their number by prepending the number with a
-`\fB#\fR' (for example \fB#0\fR or \fB#65534\fR).
+`\fB#\fR' (for example \fB#0\fR or \fB#65534\fR). The \fImode\fR needs
+to be specified in octal.
 
 If \-\-update is specified and \fBfile\fR exists, it is immediately
 set to the new owner and mode.