obmc-phosphor-image: improve description

Make it clear that obmc-phosphor-image is a full feature image and not a
minimal image.

Change-Id: Ib28de97119b782c3b12c09dab4300bd3a0c15331
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/images/obmc-phosphor-image.bb b/recipes-phosphor/images/obmc-phosphor-image.bb
index c13a132..dc7050a 100644
--- a/recipes-phosphor/images/obmc-phosphor-image.bb
+++ b/recipes-phosphor/images/obmc-phosphor-image.bb
@@ -1,4 +1,6 @@
-DESCRIPTION = "Image with Phosphor, an OpenBMC framework."
+DESCRIPTION = "Image with Phosphor, a software stack for hardware management \
+in devices with baseboard management controllers.  The image supports the \
+full OpenBMC feature set for devices of all types."
 
 IMAGE_LINGUAS = ""