modules: readme files regenerated - app_perl ... [skip ci]

src/modules/app_perl/README

@@ -427,7 +427,7 @@ modparam("app_perl", "parse_mode", 1)
 
    Allows to enable warning for perl_parse(). If set to 1, "-w" is passed
    to perl_parse() and detected warnings in the Perl script should be
-   printed to the log.
+   printed to the log. If set to 1, then "-W" is passed to perl_parse().
 
    Default value is 0.