[libnotify] docs/notify-send: Add --transient option to manpage

[Marco Trevisan <marcotrevi src gnome org>]

commit 997115b45953c90eb64860629f826daa494625a5
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed Apr 27 21:25:10 2022 +0200

    docs/notify-send: Add --transient option to manpage

 docs/notify-send.xml | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/docs/notify-send.xml b/docs/notify-send.xml
index 041466a..cab6fe9 100644
--- a/docs/notify-send.xml
+++ b/docs/notify-send.xml
@@ -122,6 +122,12 @@
             <para>Wait for the notification to be closed before exiting. If the <option>expire-time</option> 
is set, it will be used as the maximum waiting time.</para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term><option>-e</option>, <option>--transient</option></term>
+          <listitem>
+            <para>Show a transient notification. Transient notifications by-pass the server's persistence 
capability, if any. And so it won't be preserved until the user acknowledges it.</para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </refsection>
   <refsection>