Update repository link in main.c: bel2125/civetweb --> civetweb/civetweb

src/main.c

@@ -221,7 +221,7 @@ static NO_RETURN void show_usage_and_exit(const char *exeName)
 static const char *config_file_top_comment =
     "# Civetweb web server configuration file.\n"
     "# For detailed description of every option, visit\n"
-    "# https://github.com/bel2125/civetweb/blob/master/docs/UserManual.md\n"
+    "# https://github.com/civetweb/civetweb/blob/master/docs/UserManual.md\n"
     "# Lines starting with '#' and empty lines are ignored.\n"
     "# To make a change, remove leading '#', modify option's value,\n"
     "# save this file and then restart Civetweb.\n\n";