fixup! BOLT 1: add networks to init message.

Recommend against fwding to irrelevant gossip msgs.

Author: rustyrussell

07-routing-gossip.md

@@ -912,6 +912,8 @@ A node:
   the arrival times of the messages.
     - Note: this results in staggered announcements that are unique (not
     duplicated).
+	- SHOULD NOT forward gossip messages to peers who sent `networks` in `init`
+	  and did not specify the `chain_hash` of this gossip message.
   - MAY re-announce its channels regularly.
     - Note: this is discouraged, in order to keep the resource requirements low.
   - upon connection establishment: