documentation: Prepared for YP 1.6.3 doc release.

Updated the following:

 * poky.ent - bumped the variables for 1.6.3
 * <manuals>.xml - updated the manual revision tables for
   June of 2015.
 * mega-manual.sed - Rolled the 1.6.2 string to 1.6.3 so links
   in mega-manual will work locally.

(From yocto-docs rev: b3048611d268d129e9e1244d8dab6203519aa361)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/kernel-dev/kernel-dev.xml

@@ -61,6 +61,11 @@
                 <date>November 2014</date>
                 <revremark>Released with the Yocto Project 1.6.2 Release.</revremark>
             </revision>
+            <revision>
+                <revnumber>1.6.3</revnumber>
+                <date>March 2015</date>
+                <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
+            </revision>
         </revhistory>
 
     <copyright>