Fix mallard validation errors in manual pages.

help/C/bugs.page

@@ -2,13 +2,13 @@
       type="guide"
       id="bugs">
 
-  <title>Found a bug?</title>
-
   <info>
     <link type="guide" xref="index#contribute"/>
     <link type="next" xref="limits"/>
   </info>
 
+  <title>Found a bug?</title>
+
   <p>If you suspect you've found a bug in Geary, please <link
   href="https://wiki.gnome.org/Apps/Geary/Contact">get in touch</link>
   about it so it can be fixed.</p>

help/C/contributing.page

@@ -2,13 +2,13 @@
       type="guide"
       id="contributing">
 
-  <title>Contribute to Geary</title>
-
   <info>
     <link type="guide" xref="index#contribute"/>
     <link type="next" xref="bugs" />
   </info>
 
+  <title>Contribute to Geary</title>
+
   <p>Want to help improve Geary? There are a number of ways you can
   contribute:</p>
 

help/C/limits.page

@@ -2,12 +2,12 @@
       type="topic"
       id="limits">
 
-  <title>Limitations</title>
-
   <info>
     <link type="guide" xref="index#contribute"/>
   </info>
 
+  <title>Limitations</title>
+
   <p>Geary is still in early development. Geary supports IMAP and has
   been tested with Gmail, Yahoo, and the free Dovecot mail server.
   Experimental support for Outlook.com is provided.  Geary may not yet