Add a screenshot for charactermap and rename the files to be a bit easier on the tooling.

source/3/3.3/3.3.8/charactermap.rst

@@ -5,10 +5,13 @@ Description
 -----------
 Character Map allows you to type symbols that normally you may not have a key for on your keyboard (i.e. if you want to use a character from another language).
 
-Useage/Screenshots
+Usage/Screenshots
 ------------------
 A really useful keyboard shortcut is Ctrl + F to search for symbols which can make finding the correct one much faster.
 
+.. image:: charactermap-screenshot.png
+         :width: 80%
+
 Version
 -------
 Lubuntu currently ships with version 1.10.0.

source/3/3.3/accessories.rst

@@ -10,4 +10,4 @@ This chapter contains the list of accessories installed by default.
    3.3.3/galculator
    3.3.4/leafpad
    3.3.6/xpad
-   3.3.8/Character_Map
+   3.3.8/charactermap