The grep given in the help from the program to process the
effective-TLD list only worked for voodoo reasons.
Replaced it with an actually-correct use of grep.
The commands given used the name effective_tld_names.dat in the URL
fetched; however, the relevant file has (for some time now) said
explicitly "Please pull this list from, and only from
https://publicsuffix.org/list/public_suffix_list.dat"
Changed the name used to match that URL.
Revised the output file's suggested name and the instructions for what
to do with its contents, making clear they *replace* what was there
before ...
Fixed some typos and related ugliness.
Change-Id: Iacd186c0003227d657099716262eb3a89c9e5f1b
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>