Update xdg-utils to the latest version available in git.

third_party/xdg-utils/scripts/desc/xdg-mime.xml

 <?xml version="1.0"?>
 <?xml-stylesheet type="text/xsl"
    href="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"?>
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
     "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
 ]>
 <refentry id="xdg-mime">
   <refentryinfo>
     <title>xdg-mime Manual</title>
     <copyright>
@@ skipping 126 matching lines @@
           </simpara>
         </listitem>
       </varlistentry>
 
       <varlistentry>
         <term>install</term>
         <listitem>
           <simpara>
             Adds the file type descriptions provided in <replaceable>mimetypes-file</replaceable>
             to the desktop environment. <replaceable>mimetypes-file</replaceable>
-            must be a XML file that follows the freedesktop.org 
+            must be a XML file that follows the freedesktop.org
             Shared MIME-info Database specification
             and that has a mime-info element as its document root. For
             each new file type one or more icons with name
-            <replaceable>major</replaceable>-<replaceable>minor</replaceable>
+            <replaceable>type</replaceable>-<replaceable>subtype</replaceable>
             must be installed with the <command>xdg-icon-resource</command>
             command in the <emphasis>mimetypes</emphasis> context. For example the
-            application/vnd.oasis.opendocument.text filetype requires an
-            icon by the name of application-vnd.oasis.opendocument.text
-            to be installed.
+            filetype application/vnd.oasis.opendocument.text requires an
+            icon named application-vnd.oasis.opendocument.text
+            to be installed (unless the file type recommends another icon name).
           </simpara>
         </listitem>
       </varlistentry>
 
       <varlistentry>
         <term>uninstall</term>
         <listitem>
           <simpara>
             Removes the file type descriptions provided in <replaceable>mimetypes-file</replaceable>
             and previously added with <command>xdg-mime install</command> from the
@@ skipping 197 matching lines @@
   &lt;/mime-type&gt;
 &lt;/mime-info&gt;
 </programlisting>An icon for this new file type must also be installed, for
 example with:
 <programlisting>
 xdg-icon-resource install --context mimetypes --size 64 shiny-file-icon.png text-x-shiny
 </programlisting>
     </para>
   </refsect1>
 </refentry>