ref-manual: Updated PACKAGE_ARCH variable description.

I added a link to the BUILD_ARCH variable.  The variable is part
of the glossary but for some reason there was no link to it.
I also added a note for a link to the SDK_ARCH variable, which
was described inline.  By convention, I do not like to link to
variables inline as the underlining used to indicate a link messes
with with underscore characters that are usually a part of a
varible's name.

(From yocto-docs rev: a2f487141375ee7ce226eece85424e709ddc67a3)

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

1 files changed, 9 insertions, 3 deletions

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 2056cdf34d..89f0af7990 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -9388,11 +9388,17 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     By default, the value of this variable is set to
                     <link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link>
                     when building for the target,
-                    <filename>BUILD_ARCH</filename> when building for the
-                    build host and "${SDK_ARCH}-${SDKPKGSUFFIX}" when building
+                    <link linkend='var-BUILD_ARCH'><filename>BUILD_ARCH</filename></link>
+                    when building for the
+                    build host, and "${SDK_ARCH}-${SDKPKGSUFFIX}" when building
                     for the SDK.
+                    <note>
+                        See
+                        <link linkend='var-SDK_ARCH'><filename>SDK_ARCH</filename></link>
+                        for more information.
+                    </note>
                     However, if your recipe's output packages are built
-                    specific to the target machine rather than general for
+                    specific to the target machine rather than generally for
                     the architecture of the machine, you should set
                     <filename>PACKAGE_ARCH</filename> to the value of
                     <link linkend='var-MACHINE_ARCH'><filename>MACHINE_ARCH</filename></link>