Documentation failed due to change in the way the default parameter for poly_degree of from_degree() is set

The documentation, specifically the examples, contains the following line:

fx_interp = mp.interpolate(fx, spatial_dimension=1, poly_degree=4)

which after MR !64 (merged) will now fail because the signature for the interpolate() function is:

def interpolate(fct, spatial_dimension, poly_degree, lp_degree=None):

The function still relies on the mechanism that replace lp_degree if it is None with the default value. Instead, the default value stored in minterpy.global_settings.DEFAULT_LP_DEG should be used directly.

PS: It's a good idea to revisit and try to resolve Issue #91 (closed) to catch this kind of problems during development before merging.