Documentation update

Referenced several missing options in the Configuration / Webserver
section of the Admin guide

docbook/Admin_Guide/en-US/Configuration.xml

@@ -161,7 +161,55 @@
 
     <section id="admin.config.webserver">
         <title>Webserver</title>
-        <para></para>
+		<variablelist>
+			<varlistentry>
+				<term>$g_session_handler</term>
+				<listitem>
+					<para>Session handler. Possible values are as per the
+					list below; the default is <emphasis>php</emphasis>.
+						<itemizedlist>
+							<listitem><para><emphasis>php</emphasis>: PHP filesystem sessions</para></listitem>
+							<listitem><para><emphasis>adodb</emphasis>: Database storage sessions</para></listitem>
+							<listitem><para><emphasis>memcached</emphasis>: Memcached storage sessions</para></listitem>
+						</itemizedlist>
+					</para>
+				</listitem>
+			</varlistentry>
+
+			<varlistentry>
+				<term>$g_session_save_path</term>
+				<listitem>
+					<para>Location where session files are stored.
+					The default is <emphasis>false</emphasis>, meaning
+					the session handler's default location will be used.
+					</para>
+				</listitem>
+			</varlistentry>
+
+			<varlistentry>
+				<term>$g_session_validation</term>
+				<listitem>
+					<para>Use Session validation (defaults to <emphasis>ON</emphasis>)
+					</para>
+					<para><emphasis>WARNING: Disabling this could be a potential security risk</emphasis></para>
+				</listitem>
+			</varlistentry>
+
+			<varlistentry>
+				<term>$g_form_security_validation</term>
+				<listitem>
+					<para>Form security validation, defaults to <emphasis>ON</emphasis>.
+					This protects against <ulink url="http://en.wikipedia.org/wiki/Cross-site_request_forgery">
+						Cross-Site Request Forgery</ulink>.
+					Some proxy servers may not correctly work with this option enabled
+					because they cache pages incorrectly.
+					</para>
+					<para><emphasis>WARNING: Disabling this option is a security risk,
+					it is strongly recommended to leave it ON</emphasis></para>
+				</listitem>
+			</varlistentry>
+
+		</variablelist>
     </section>
 
     <section id="admin.config.settings">