man: tc-ife: add default type note

This patch updates the tc-ife man page that the default IFE ethertype
will be used if it's not specified.

Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
diff --git a/man/man8/tc-ife.8 b/man/man8/tc-ife.8
index 3a42d51..fd2df6c 100644
--- a/man/man8/tc-ife.8
+++ b/man/man8/tc-ife.8
@@ -82,7 +82,7 @@
 Optional six byte destination or source MAC address to encode.
 .TP
 .BI type " TYPE"
-Optional 16-bit ethertype to encode.
+Optional 16-bit ethertype to encode. If not specified value of 0xED3E will be used.
 .TP
 .BI CONTROL
 Action to take following an encode/decode.