patch 8.2.3797: no good reason to limit the message history in tiny version

Problem:    No good reason to limit the message history in the tiny version.
Solution:   Always use 200.
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 5334ac0..cbb320a 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -29,8 +29,7 @@
 				Clear messages, keeping only the {count} most
 				recent ones.
 
-The number of remembered messages is fixed at 20 for the tiny version and 200
-for other versions.
+The number of remembered messages is fixed at 200.
 
 								*g<*
 The "g<" command can be used to see the last page of previous command output.