doc: Mention the default io_method

It was previously not documented.

Author: Daniel Westermann (DWE) 
Reviewed-by: Pavel Stehule 
Discussion: https://www.postgresql.org/message-id/flat/ZR0P278MB04279CB0C1D8F49DE68F168ED2AF2%40ZR0P278MB0427.CHEP278.PROD.OUTLOOK.COM

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 021153b2a5f278449cdbb4ff613072c8007f9f30..7e0e5400ee128ebfcf641a55b6c93839c3141f42 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2779,6 +2779,7 @@ include_dir 'conf.d'
            
           
          
+         The default is worker.
         
         
          This parameter can only be set at server start.