[docs] Update keystore location (elastic#111994) (elastic#113179)

Co-authored-by: Kibana Machine <[email protected]>

Co-authored-by: Jonathan Budzenski <[email protected]>

Author: kibanamachine

docs/setup/secure-settings.asciidoc

@@ -18,8 +18,8 @@ To create the `kibana.keystore`, use the `create` command:
 bin/kibana-keystore create
 ----------------------------------------------------------------
 
-The file `kibana.keystore` will be created in the directory defined by the
-<<path-data, `path.data`>> configuration setting.
+The file `kibana.keystore` will be created in the `config` directory defined by the
+environment variable `KBN_PATH_CONF`.
 
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