BUGFIX: Fix hardcoded help message in 'lymph help'

Because other libraries can register a new cli entry point, when
calling 'lymph help' user should be able to see all registered
cli commands and not just the lymph hardcoded one.
I couldn't find a better name for it, that suppose to be the minimum space between command name and description which is 2 spaces, when it exceeded the command name and description will be in different lines.

If you have a better name please suggest.