ref-manual: Edits to the SDK_DIR and SDK_OUTPUT variables.

(From yocto-docs rev: a150ee32fda9222f749f666ebf5f3db30165be2e)

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

documentation/ref-manual/ref-variables.xml

@@ -5565,6 +5565,13 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     <literallayout class='monospaced'>
      SDK_DIR = "${<link linkend='var-WORKDIR'><filename>WORKDIR</filename></link>}/sdk"
                     </literallayout>
+                    <note>
+                        The <filename>SDK_DIR</filename> directory is a
+                        temporary directory as it is part of
+                        <filename>WORKDIR</filename>.
+                        The final output directory is
+                        <link linkend='var-SDK_DEPLOY'><filename>SDK_DEPLOY</filename></link>.
+                    </note>
                 </para>
             </glossdef>
         </glossentry>
@@ -5599,6 +5606,15 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     <literallayout class='monospaced'>
      SDK_OUTPUT = "${<link linkend='var-SDK_DIR'>SDK_DIR</link>}/image"
                     </literallayout>
+                    <note>
+                        The <filename>SDK_OUTPUT</filename> directory is a
+                        temporary directory as it is part of
+                        <filename>WORKDIR</filename> by way of
+                        <filename>SDK_DIR</filename>.
+                        The final output directory is
+                        <link linkend='var-SDK_DEPLOY'><filename>SDK_DEPLOY</filename></link>.
+                    </note>
+
                 </para>
             </glossdef>
         </glossentry>