Fix WPS docs for LABEL method

Since we don't support LABEL method in startWps, document
it explicitly.

Bug: 18298388

Change-Id: I5d4c2475a68f1b41e5fc449c911b7b01b3b82fc4
1 file changed
tree: 1f2351122dc2243ff0706e1bfedcb6f49d681e6e
  1. framework/