fixing typos

Change-Id: I215e1e0208a073db80ec6f87695d734cf40fabe3
Signed-off-by: Jim Thompson <jim@netgate.com>
diff --git a/src/vnet/bier/bier_imp.h b/src/vnet/bier/bier_imp.h
index cdc4dbb..f458772 100644
--- a/src/vnet/bier/bier_imp.h
+++ b/src/vnet/bier/bier_imp.h
@@ -17,7 +17,7 @@
  *
  * A BIER imposition object is present in the IP mcast output list
  * and represents the imposition of a BIER bitmask. After BIER header
- * imposition the packet is forward within the appropriate/specifid
+ * imposition the packet is forward within the appropriate/specified
  * BIER table
  */