ref-manual: Changed "post 2.6" to correct wording.

I changed the wording "post 2.6" to state "2.6 and
forward".  It was incorrect as the changes are  inclusive
of YP release 2.6.

(From yocto-docs rev: 93720a1c072ad6268cb5681c51660f03059d880a)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-variables.xml

@@ -7515,7 +7515,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
 
         <glossentry id='var-KERNEL_IMAGE_BASE_NAME'><glossterm>KERNEL_IMAGE_BASE_NAME</glossterm>
             <info>
-                KERNEL_IMAGE_BASE_NAME[doc] = "The base name of the kernel image. Deprecated post Yocto Project 2.6 release."
+                KERNEL_IMAGE_BASE_NAME[doc] = "The base name of the kernel image. Deprecated for Yocto Project 2.6 release and forward."
             </info>
             <glossdef>
                 <para role="glossdeffirst">
@@ -7525,7 +7525,8 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                         <link linkend='var-KERNEL_IMAGE_NAME'><filename>KERNEL_IMAGE_NAME</filename></link>
                         variable for information.
                         The <filename>KERNEL_IMAGE_BASE_NAME</filename>
-                        variable's name has changed post Yocto Project 2.6.
+                        variable's name has changed for Yocto Project 2.6
+                        release and forward.
                     </note>
                     Prior to the 2.6 release of Yocto Project, this variable
                     was set in the