Clean up help message for the public suffix list processor

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>

0 files changed, 0 insertions, 0 deletions