ll renamed to low_loss in create-model

[maclariz]

Documentation at https://hyperspy.org/exspy/user_guide/eels.html has:

m = s.create_model(ll=ll)

However ll gives an error when using. At:

https://hyperspy.org/exspy/reference/signals.html#exspy.signals.EELSSpectrum.create_model

the function definition in top line gives:

create_model(low_loss=None, auto_background=True, auto_add_edges=True, GOS='dft', gos_file_path=None, dictionary=None)

which is correct. But documentation below still says:

ll (None or EELSSpectrum) – If an EELSSpectrum is provided, it will be assumed that it is a low-loss EELS spectrum, and it will be used to simulate the effect of multiple scattering by convolving it with the EELS spectrum.

Please complete the renaming consistently throughout

[ericpre]

Thank you @maclariz, the docstring needs fixing indeed!