Fix typo in protocol.sgml.

Amit Kapila · Amit Kapila · commit e1915646658d · 2021-08-19T09:05:54.000+05:30
The 'Stream Stop' message is misspelled as 'Stream End' in the docs. Author: Masahiko Sawada Backpatch-through: 14, where it was introduced Discussion: https://postgr.es/m/CAD21AoDeScrsHhLyEPYqN3sydg6PxAPVBboK=30xJfUVihNZDA@mail.gmail.com
diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
@@ -7178,7 +7178,7 @@ Truncate
 
 <para>
 
-The following messages (Stream Start, Stream End, Stream Commit, and
+The following messages (Stream Start, Stream Stop, Stream Commit, and
 Stream Abort) are available since protocol version 2.
 
 </para>
