doc: Small wording improvement

Replace "checkpoint segment" with "WAL segment".

Reported-by: Maksim Milyutin 

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index c3bf3f9fd6d4dbdd0a62991600e13323de482e53..259a2d83b4a4671088ca083c4ef61ab5aaeb62a4 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2778,7 +2778,7 @@ include_dir 'conf.d'
       
        
         Write a message to the server log if checkpoints caused by
-        the filling of checkpoint segment files happen closer together
+        the filling of WAL segment files happen closer together
         than this many seconds (which suggests that
         max_wal_size ought to be raised).  The default is
         30 seconds (30s).  Zero disables the warning.