htop has been licensed as GPLv2 but there was inconsistency regarding the
option to choose "any later version" as granted by the license.
This commit clarifies the htop dev team is fine with that choice.
There was wording about brace-enclosing single code statements
being 'strongly encouraged' - this isn't consistently used and
IMO it introduces unnecessary noise in otherwise neat, concise
code.
I've reworded (dropped) this section and also fixed a handful
of minor typos while reading this doc a little more carefully.
