NTB: Fix documentation for ntb_peer_db_clear.

The documentation should say "peer" not "local" when referring to the
peer doorbell register.

Reported-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index e3d3299..f798e2a 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -794,7 +794,7 @@
 }
 
 /**
- * ntb_peer_db_clear() - clear bits in the local doorbell register
+ * ntb_peer_db_clear() - clear bits in the peer doorbell register
  * @ntb:	NTB device context.
  * @db_bits:	Doorbell bits to clear.
  *