Inexistent function reference in `pvlib.irradiance.poa_components`

[echedey-ls]

The following referenced function does not exist: https://github.com/pvlib/pvlib-python/blob/19c9598355b8243038bdeb1253d219e0371f71af/pvlib/irradiance.py#L474

A alternative should be found and referenced with :py:func:`pvlib.<submodule>.<function_name>`

[cwhanse]

Should point to :py:funcpvlib.irradiance.get_ground_diffuse

[echedey-ls]

Good first issue for newcomers or do you prefer a PR?

[AdamRJensen]

Good first issue for newcomers or do you prefer a PR?

I like the idea of leaving it, so we have something in case someone comes by.

[studentayaaljabbari]

I'd like to work on this issue. From what I understand, we need to:

1. Fix the documentation reference in pvlib/irradiance.py line 474
2. Change the reference from the non-existent grounddiffuse function to pvlib.irradiance.get_ground_diffuse
3. Use the correct Sphinx documentation format: :py:func:pvlib.irradiance.get_ground_diffuse

[cwhanse]

@studentayaaljabbari please do!