docs: Update RTD docs to include spark and trino

[achals]

Signed-off-by: Achal Shah achals@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #2539 (3131340) into master (11a342f) will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2539      +/-   ##
==========================================
- Coverage   81.77%   81.59%   -0.18%     
==========================================
  Files         141      141              
  Lines       11939    11997      +58     
==========================================
+ Hits         9763     9789      +26     
- Misses       2176     2208      +32     

Flag	Coverage Δ
integrationtests	73.56% <ø> (-0.61%)	⬇️
unittests	57.62% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/wait.py	58.82% <0.00%> (-35.30%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	93.54% <0.00%> (-6.46%)	⬇️
sdk/python/feast/request_feature_view.py	62.50% <0.00%> (-5.07%)	⬇️
.../integration/online_store/test_online_retrieval.py	96.84% <0.00%> (-3.16%)	⬇️
sdk/python/feast/on_demand_feature_view.py	92.37% <0.00%> (-1.15%)	⬇️
...ython/feast/embedded_go/online_features_service.py	96.42% <0.00%> (-0.90%)	⬇️
.../integration/online_store/test_universal_online.py	92.57% <0.00%> (-0.86%)	⬇️
sdk/python/feast/data_source.py	66.91% <0.00%> (-0.46%)	⬇️
sdk/python/tests/unit/test_data_sources.py	100.00% <0.00%> (ø)
...n/tests/integration/registration/test_inference.py	100.00% <0.00%> (ø)
... and 4 more

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[adchia]

/lgtm

[feast-ci-bot]

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