Restore monospace markup for `pentadactylrc' and the like.

This was partly lost in the previous change due to linkification, but the <t>
and <tt> tags can actually be used together.

common/locale/en-US/map.xml

@@ -67,7 +67,7 @@
 <warning>
     It is important to note that mappings are <em>not</em>
     automatically saved between sessions. In order to preserve them,
-    they must either be added to your <t>&dactyl.name;rc</t> or
+    they must either be added to your <tt><t>&dactyl.name;rc</t></tt> or
     saved via the <ex>:mk&dactyl.name;rc</ex> command.
 </warning>
 

common/locale/en-US/options.xml

@@ -528,7 +528,7 @@
     <description>
         <p>
             Allow reading of an RC file in the current directory. This file is
-            sourced after the default <t>&dactyl.name;rc</t> file in your
+            sourced after the default <tt><t>&dactyl.name;rc</t></tt> file in your
             home directory.
         </p>
     </description>
@@ -888,9 +888,9 @@
     <description>
         <p>
             Load plugin scripts when starting up. When on, yet unloaded plugins
-            are automatically loaded after the <t>&dactyl.name;rc</t> file has been
+            are automatically loaded after the <tt><t>&dactyl.name;rc</t></tt> file has been
             sourced. To load plugins earlier, use the <ex>:loadplugins</ex>
-            command within <t>&dactyl.name;rc</t>.
+            command within <tt><t>&dactyl.name;rc</t></tt>.
         </p>
     </description>
 </item>

common/locale/en-US/repeat.xml

@@ -195,9 +195,9 @@
     <description>
         <p>
             Immediately load all plugins which have yet to be loaded. Because
-            plugins are not automatically loaded until after &dactyl.name;rc
+            plugins are not automatically loaded until after <tt><t>&dactyl.name;rc</t></tt>
             is sourced, this command must be placed early in the
-            &dactyl.name;rc file if &dactyl.name;rc uses commands or options
+            <tt>&dactyl.name;rc</tt> file if <tt>&dactyl.name;rc</tt> uses commands or options
             which are defined by plugins. Additionally, this command allows
             newly installed plugins to be easily loaded without restarting
             &dactyl.appname;.

pentadactyl/locale/en-US/tutorial.xml

@@ -259,12 +259,12 @@
 
 <code><k name="Esc"/></code>
 
-<h2 tag="pentadactylrc">Saving for posterity—pentadactylrc</h2>
+<h2 tag="pentadactylrc">Saving for posterity—<tt>pentadactylrc</tt></h2>
 
 <p>
     Once you get &dactyl.appname; set up with your desired options, maps, and commands,
     you'll probably want them to be available the next time you open &dactyl.appname;.
-    Continuing the Vim theme, this is done with a pentadactylrc file.
+    Continuing the Vim theme, this is done with a <tt>pentadactylrc</tt> file.
 </p>
 
 <p>