Docs not updated for QCFractal 0.50+

[mattwthompson]

Many API breaks from #195 were not reflected in docs/api.rst

This module was removed:

openff-qcsubmit/docs/api.rst

Lines 106 to 122 in c298486

	Caching
	"""""""
	.. currentmodule:: openff.qcsubmit.results.caching
	.. autosummary::
	:nosignatures:
	:toctree: api/generated/
	clear_results_caches
	batched_indices
	cached_fractal_client
	cached_query_procedures
	cached_query_molecules
	cached_query_basic_results
	cached_query_optimization_results
	cached_query_torsion_drive_results

This class was removed:

openff-qcsubmit/docs/api.rst

Line 219 in c298486

ClientHandler

ResultRecordFilter and ResultRecordGroupFilter were renamed

To reproduce:

$ cd docs
$ python -m sphinx -T -W --keep-going -b html -d _build/doctrees -D language=en . html/