FEniCS/basix

Document order of Polysets

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jorgensd commented

Trivial for intervals.

Non-trivial for triangles, quads etc.
These assumptions are shown for certain subsets in:
https://docs.fenicsproject.org/basix/main/python/demo/demo_custom_element.py.html#lagrange-element-with-bubble
but to expose the true power of custom elements this needs to be easily accessible.