meta-ibm: Add sample build invocations

Display sample build invocations when sourcing oe-init-build-env.

These are only the most commonly used combinations of
distro/machine/image and not an exhaustive list of all supported
configurations.  Rather the purpose of displaying these is to help
bitbake newcomers quickly initiate a build without having to set DISTRO
and MACHINE in local.conf or wonder which image recipe to bake.

Change-Id: I7247ba2d84124c3a30792d3badf67657ed49ad26
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-witherspoon/conf/conf-notes.txt b/meta-witherspoon/conf/conf-notes.txt
index 9b3c01a..0c78d45 100644
--- a/meta-witherspoon/conf/conf-notes.txt
+++ b/meta-witherspoon/conf/conf-notes.txt
@@ -1,2 +1,12 @@
-Common targets are:
-     obmc-phosphor-image
+Sample meta-witherspoon build invocations:
+
+mihawk:
+DISTRO=openbmc-witherspoon MACHINE=mihawk bitbake obmc-phosphor-image
+swift:
+DISTRO=openbmc-witherspoon MACHINE=swift bitbake obmc-phosphor-image
+witherspoon:
+DISTRO=openbmc-witherspoon MACHINE=witherspoon bitbake obmc-phosphor-image
+witherspoon-tacoma:
+DISTRO=openbmc-openpower MACHINE=witherspoon-tacoma bitbake aspeed-image-norootfs
+witherspoon-128:
+DISTRO=openbmc-witherspoon MACHINE=witherspoon-128 bitbake obmc-phosphor-image