brctl: fixing stp parameters incompatibility

function                                             old     new   delta
static.stp_opts                                        -      23     +23
brctl_main                                          1148    1169     +21
packed_usage                                       26786   26794      +8
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/0 up/down: 52/0)               Total: 52 bytes

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/usage.h b/include/usage.h
index a7855cd..40cb6b2 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -187,7 +187,7 @@
      "\n	setpathcost BRIDGE COST		Set path cost" \
      "\n	setportprio BRIDGE PRIO		Set port priority" \
      "\n	setbridgeprio BRIDGE PRIO	Set bridge priority" \
-     "\n	stp BRIDGE [1|0]		STP on/off" \
+     "\n	stp BRIDGE [1/yes/on|0/no/off]	STP on/off" \
 	) \
 
 #define bunzip2_trivial_usage \