docs: Fix RTD

[felixwang9817]

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[achals]

/ok-to-test
/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817

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[codecov-commenter]

Codecov Report

Merging #3102 (f039531) into master (5b0cc87) will increase coverage by 8.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3102      +/-   ##
==========================================
+ Coverage   66.93%   75.79%   +8.86%     
==========================================
  Files         173      207      +34     
  Lines       15056    17077    +2021     
==========================================
+ Hits        10077    12943    +2866     
+ Misses       4979     4134     -845     

Flag	Coverage Δ
integrationtests	66.93% <ø> (+<0.01%)	⬆️
unittests	58.25% <ø> (?)

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

Impacted Files	Coverage Δ
.../python/feast/infra/feature_servers/base_config.py	100.00% <0.00%> (ø)
...n/feast/infra/feature_servers/aws_lambda/config.py	100.00% <0.00%> (ø)
...s/contrib/spark_offline_store/tests/data_source.py	40.74% <0.00%> (ø)
...ffline_stores/contrib/spark_offline_store/spark.py	32.98% <0.00%> (ø)
...stores/contrib/trino_offline_store/trino_source.py	5.37% <0.00%> (ø)
sdk/python/feast/transformation_server.py	40.47% <0.00%> (ø)
...s/contrib/trino_offline_store/tests/data_source.py	17.64% <0.00%> (ø)
...ffline_stores/contrib/trino_offline_store/trino.py	8.72% <0.00%> (ø)
..._stores/contrib/postgres_offline_store/postgres.py	35.22% <0.00%> (ø)
...ontrib/postgres_offline_store/tests/data_source.py	51.02% <0.00%> (ø)
... and 106 more

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