Clarify handshake description in replication documentation

Removed the word 'sequence' for clarity in the replication description.

Author: TropicolX

stage_descriptions/replication-12-hd5.md

@@ -14,7 +14,7 @@ The tester will execute your program like this:
 ./your_program.sh --port <PORT>
 ```
 
-It will then start **multiple** replicas that will each connect to your server, complete the handshake sequence, and receive the initial RDB file.
+It will then start **multiple** replicas that will each connect to your server, complete the handshake, and receive the initial RDB file.
 
 Next, the tester will send `SET` commands to the master from a separate client.