Update 0004_ws2p_v1.md

rfc/0004_ws2p_v1.md

@@ -109,7 +109,7 @@ sig:  ed25519 signature of the RAW format message in base64.
     
 raw format : `WS2P:OK:currency_name:pub:challenge`
 
-_*Be careful, this time the challenge is the one that **the remote node sent us*** in **its own CONNECT message**._
+_**Be careful**, this time the challenge is the one that **the remote node sent us** in **its own CONNECT message**._
 
 ## HEAD messages