[sdk/kdesrc-build/docbook_historied_per_file] doc/cmdline: Add support library for handling /etc/os-release.

Git commit c618104022d212e63f4476f9790fcba350381e9d by Michael Pyne.
Committed on 14/10/2018 at 22:41.
Pushed by ashark into branch 'docbook_historied_per_file'.

Add support library for handling /etc/os-release.

This gets me just that little itty bitty step farther towards
implementing support for distro-specific things (like listing Perl
dependencies, build dependencies, etc.)

See also https://phabricator.kde.org/T9507

Original commit: f3f100de
https://invent.kde.org/sdk/kdesrc-build/-/commit/f3f100de6410d5ad9b84bef2d237ee2540e0f043

M  +10   -0    doc/cmdline/supported-cmdline-params.docbook

https://invent.kde.org/sdk/kdesrc-build/-/commit/c618104022d212e63f4476f9790fcba350381e9d

diff --git a/doc/cmdline/supported-cmdline-params.docbook b/doc/cmdline/supported-cmdline-params.docbook
index b57b55fa..2ead61e1 100644
--- a/doc/cmdline/supported-cmdline-params.docbook
+++ b/doc/cmdline/supported-cmdline-params.docbook
@@ -31,6 +31,16 @@ Display the program version.
 </para></listitem>
 </varlistentry>
 
+<varlistentry id="cmdline-show-info">
+<term><parameter>--show-info</parameter></term>
+<listitem><para>
+Displays information about &kdesrc-build; and the operating system, that may
+prove useful in bug reports or when asking for help in forums or mailing lists.
+</para>
+<para>Available since version 18.11.</para>
+</listitem>
+</varlistentry>
+
 <varlistentry id="cmdline-author">
 <term><parameter>--author</parameter></term>
 <listitem><para>