[epiphany] help: Explain how to enable mouse gestures; fix list style

[Andre Klapper <aklapper src gnome org>]

commit 49a4d176899757609e10ed076dbd53df92067ce7
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon Mar 22 08:11:04 2021 +0100

    help: Explain how to enable mouse gestures; fix list style
    
    Fixes #1481

 help/C/pref-mouse-gestures.page | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/help/C/pref-mouse-gestures.page b/help/C/pref-mouse-gestures.page
index 4e883f767..e105701f0 100644
--- a/help/C/pref-mouse-gestures.page
+++ b/help/C/pref-mouse-gestures.page
@@ -6,6 +6,7 @@
   <info>
     <link type="guide" xref="index#pref"/>
     <revision pkgversion="3.34" date="2019-06-14" status="review"/>
+    <revision pkgversion="3.38" date="2021-03-22" status="review"/>
 
     <credit type="author copyright">
       <name>Jan-Michael Brummer</name>
@@ -23,10 +24,22 @@
   <p>Mouse gestures offer a quick option to surf web pages without moving your hand to the keyboard.
   These gestures are triggered by holding the middle mouse button while performing one of the
   following mouse movements. If your mouse does not have a middle mouse button, you cannot use mouse
-  gestures.
-  The following gestures are currently supported: </p>
+  gestures.</p>
 
   <steps>
+    <item>
+      <p>Press the menu button in the top-right corner of the window and select
+      <guiseq><gui style="menuitem">Preferences</gui>
+      <gui style="tab">General</gui></guiseq>.</p>
+    </item>
+    <item>
+      <p>Under <gui>Browsing</gui>, switch on <gui style="button">Mouse Gestures</gui>.</p>
+    </item>
+  </steps>
+
+  <p>The following gestures are currently supported:</p>
+
+  <list>
     <item>
       <p>Holding the middle mouse button, dragging left, and then releasing the middle mouse button will 
navigate backward.</p>
     </item>
@@ -42,6 +55,6 @@
     <item>
       <p>Holding the middle mouse button, dragging first upwards and then downwards, then releasing the 
middle mouse button will reload the current tab.</p>
     </item>
-  </steps>
+  </list>
 
 </page>