move --core entry in the manpage down to have it in alphabetical order (

#1731)

[ci skip]

doc/man/wesnoth.6

@@ -59,16 +59,16 @@ and removes
 goes directly to the campaign with id <id_campaign>. A selection menu will
 appear if no id was specified.
 .TP
-.BI --core \ id_core
-overrides the loaded core with the one whose id is specified.
-.TP
 .BI --campaign-difficulty[ =difficulty ]
 The difficulty of the specified campaign (1 to max). If none specified,
 the campaign difficulty selection widget will appear.
 .TP
 .BI --campaign-scenario \ id_scenario
 The id of the scenario from the specified campaign. The default is the first scenario.
 .TP
+.BI --core \ id_core
+overrides the loaded core with the one whose id is specified.
+.TP
 .BI --data-dir \ directory
 overrides the data directory with the one specified
 .TP