help output cleanup for help2man

- Don't put paths in parentheses, as help2man won't recognize and italicize
them.

- Don't use paths in examples as they get italicized, which looks bad.

- Use better spacing in the examples so that they show up on separate lines.
Include the sys_rc_path in conda info --json
Don't put newline after examples header

help2man doesn't recognize it as a header otherwise
Put parens around conda config --help paths back

It doesn't seem to make help2man italicize the names any better.
Fix undefined name error in main_remove