bug#64397: 29.0.91; Limited configuration of commands based on python-interpreter

[kobarity]

Matthias Meulien wrote:
> 
> kobarity <kobarity@gmail.com> writes:
> 
> > (...) How about the following descriptions?
> >
> > python-interpreter
> >   Python interpreter for noninteractive use.
> > python-interpreter-args
> >   Arguments for the Python interpreter for noninteractive use.
> > python-shell-interpreter
> >   Python interpreter for interactive use.
> > python-shell-interpreter-args
> >   Arguments for the Python interpreter for interactive use.
> 
> I like it.  But you skipped python-shell-interpreter-interactive-arg...

Sorry, I forgot about that.
`python-shell-interpreter-interactive-arg' is used only for prompt
detection, and its docstring has only one line:

Interpreter argument to force it to run interactively.

I think we can leave it as is, but if we want to improve it, how about
adding the second line?  I could not shorten it to fit on one line.

Interpreter argument to force it to run interactively.
This is used only for prompt detection.