Edited 13_wire_protocol.asciidoc with Atlas code editor

13_wire_protocol.asciidoc

@@ -385,7 +385,7 @@ single payment to be split into multiple parts or paths, to be assembled at the
 recipient for settlement. The rollout of MPP was coupled with a new
 `node_announcement` level feature bit that indicates that the recipient knows
 how to handle partial payments. Assuming a sender and recipient know about each
-other (possibly via a BOLT 11 invoice), then they're able to use the new
+other (possibly via a BOLT #11 invoice), then they're able to use the new
 feature without any further negotiation.
 
 Another example of an end-to-end upgrade are the various types of