[BUG] gfql undocumented

[lmeyerov]

GFQL docs issues --

• graphistry.chain([ ...]) should have a clean entry for typical use, see main README.md

• hop() params comment formatting is weird

• class Chain should have a clean entry showing its use in to/from json

• various /predicates/*.py are undocumented, see screenshot

• ... similarly, we should ensure n(), e_forward(), etc are documented, and referenced from .chain()

We should do a dedicated docs page later, esp. once we have a FEP endpoint

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https://pygraphistry.readthedocs.io/en/latest/graphistry.compute.html#predicates for pygraphistry 0.32.0: