[RFA] Make first and last lines of 'command help documentation' consistent.

[Pedro Alves]

On 7/11/19 4:49 PM, Pedro Alves wrote:
> We could also make it a gdb_assert in the add_cmd functions,
> and then make the python layer strip away any trailing whitespace.

I think this is my preferred solution, btw.  Makes it unnecessary to
add any testing infrastructure, and makes python do the right thing
automatically.

Thanks,
Pedro Alves