src/doc: improve man page and --help
Checklist
-
make -j8 test
(UNIX), orvcbuild test nosign
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
src, doc
Description of change
- added missing environment variables
- sort environment variables alphabetically
- add some highlighting to the man page
- remove stops from descriptions in --help for consistency
- few other minor tweaks to --help