Update the current.xml error message.

The previous message contained some perforce-isms that aren't applicable
in the git world.

core/apicheck_msg_current.txt

@@ -6,12 +6,11 @@ To make these errors go away, you have two choices:
    1) You can add "@hide" javadoc comments to the methods, etc. listed in the
       errors above.
 
-   2) You can update current.xml by executing the following commands:
-
-         p4 edit frameworks/base/api/current.xml
+   2) You can update current.xml by executing the following command:
          make update-api
 
-      To check in the revised current.xml, you will need OWNERS approval.
+      To submit the revised current.xml to the main Android repository,
+      you will need approval.
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