Update Outline and Structure sections about glossaries (#269)

* Update Outline and Structure sections about glossaries
* Update Structure with glossary sorting
* Update xml/docu_styleguide.structure.xml
Co-authored-by: Tom Schraitle <[email protected]>

---------

Co-authored-by: Tom Schraitle <[email protected]>

Author: dariavladykina

xml/docu_styleguide.outline.xml

@@ -260,7 +260,8 @@
     <listitem>
      <para>
       The optional glossary contains important terms in alphabetical order and
-      provides a brief explanation for each.
+      provides a brief explanation for each. For more information on creating lists
+      of terms, see <xref linkend="sec-glossary"/>.
      </para>
     </listitem>
    </varlistentry>

xml/docu_styleguide.structure.xml

@@ -1412,12 +1412,17 @@ will be displayed in &lt;emphasis role="bold"&gt;bold&lt;/emphasis&gt;</screen>
    unfamiliar terms and special jargon.
   </para>
   <para>
-   Define infinitive forms of verbs and singular nouns. Use lowercase for
-   the term unless it is a proper noun.
+   Define infinitive forms of verbs and singular nouns. Do not start the definition with the term itself.
+   Use lowercase for the term unless it is a proper noun.
   </para>
+  <para>Where applicable, group your terms with the <tag class="emptytag">glossdiv</tag>
+   tag for higher ordering.</para>
+  <para>To support automatic alphabetical ordering in localized versions,
+   use <tag>glosslist</tag> and set the style sheet parameter
+   <literal>glossary.sort</literal> to 1. This sorts glossary lists in alphabetical order.</para>
   <para>
    Use cross-references to link acronyms with their written out forms.
-   Define the written out form. Use a <emphasis>See</emphasis> reference for
+   Define the written out form. Use a <emphasis>See also</emphasis> reference for
    the acronym form to link it to the defined written out form.
   </para>
   <para>