documentation: Updated manual revision table to new date

Using May of 2015 now.

(From yocto-docs rev: b5ade15ae89769e6e9a082e48d635a09ecdcc116)

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

documentation/adt-manual/adt-manual.xml

@@ -88,7 +88,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
        </revhistory>

documentation/bsp-guide/bsp-guide.xml

@@ -100,7 +100,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
         </revhistory>

documentation/dev-manual/dev-manual.xml

@@ -78,7 +78,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
         </revhistory>

documentation/kernel-dev/kernel-dev.xml

@@ -63,7 +63,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
         </revhistory>

documentation/profile-manual/profile-manual.xml

@@ -63,7 +63,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
         </revhistory>

documentation/ref-manual/ref-manual.xml

@@ -94,7 +94,7 @@
             </revision>
             <revision>
                 <revnumber>1.6.3</revnumber>
-                <date>March 2015</date>
+                <date>May 2015</date>
                 <revremark>Released with the Yocto Project 1.6.3 Release.</revremark>
             </revision>
         </revhistory>