docs: Fix rtd docs by removing mysqlclient

[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 #2778 (4c3cb2b) into master (4ed107c) will decrease coverage by 20.84%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #2778       +/-   ##
===========================================
- Coverage   80.52%   59.68%   -20.85%     
===========================================
  Files         173      173               
  Lines       15146    15149        +3     
===========================================
- Hits        12196     9041     -3155     
- Misses       2950     6108     +3158     

Flag	Coverage Δ
integrationtests	?
unittests	59.68% <0.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)
.../integration/online_store/test_online_retrieval.py	16.84% <0.00%> (-80.00%)	⬇️
...fline_store/test_universal_historical_retrieval.py	23.80% <0.00%> (-76.20%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	19.35% <0.00%> (-74.20%)	⬇️
.../integration/online_store/test_universal_online.py	17.43% <0.00%> (-73.03%)	⬇️
...ests/integration/e2e/test_python_feature_server.py	28.35% <0.00%> (-71.65%)	⬇️
...dk/python/tests/integration/e2e/test_validation.py	27.77% <0.00%> (-71.43%)	⬇️
sdk/python/feast/wait.py	23.52% <0.00%> (-70.59%)	⬇️
...gration/registration/test_feature_service_apply.py	31.25% <0.00%> (-68.75%)	⬇️
...s/integration/registration/test_universal_types.py	32.25% <0.00%> (-67.75%)	⬇️
... and 74 more

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[achals]

Actually i think there may be a better way for this. Tomorrow morning

[adchia]

/lgtm

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