ActivationProgress: Clarify usage

As discussed in review 32148, make the Activation
Progress reusable for the current stage of firmware
update.

Change-Id: I286db0664a0892da812bde7b349c5a575c39cad0
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/xyz/openbmc_project/Software/ActivationProgress.interface.yaml b/xyz/openbmc_project/Software/ActivationProgress.interface.yaml
index 1529650..edb01d8 100644
--- a/xyz/openbmc_project/Software/ActivationProgress.interface.yaml
+++ b/xyz/openbmc_project/Software/ActivationProgress.interface.yaml
@@ -1,8 +1,9 @@
 description: >
-    Activation progress for an associated xyz.openbmc_project.Software.Version.
+    Progress for current step of an associated
+    xyz.openbmc_project.Software.Version.
 properties:
     - name: Progress
       type: byte
       description: >
         An integer between 0 and 100 representing the percentage complete of
-        the current activation progress.
+        the current step in software update.