+ Many punctuation and wording fixes:

• Whitespace before punctuation was removed.
• Numbers below 10 are spelled out as words.
• Reworded some sentences and added missing words.

+ Added a note about periodically flushing firewall rules to make sure

one is not locked out while tinkering with rulesets.

PR: docs/76533
Submitted by: Brad Davis <so14k@so14k.com>