chore: Update online store docstrings

[felixwang9817]

Signed-off-by: Felix Wang [email protected]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #3066 (ceb1432) into master (41851be) will increase coverage by 8.67%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #3066      +/-   ##
==========================================
+ Coverage   67.20%   75.87%   +8.67%     
==========================================
  Files         168      203      +35     
  Lines       15011    16983    +1972     
==========================================
+ Hits        10088    12886    +2798     
+ Misses       4923     4097     -826     

Flag	Coverage Δ
integrationtests	66.92% <33.33%> (-0.28%)	:arrow_down:
unittests	58.23% <33.33%> (?)

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/online_stores/dynamodb.py	89.78% <ø> (+10.32%)	:arrow_up:
...k/python/feast/infra/online_stores/online_store.py	80.00% <0.00%> (ø)
sdk/python/feast/infra/online_stores/redis.py	95.06% <ø> (ø)
sdk/python/feast/infra/online_stores/sqlite.py	94.48% <ø> (+10.23%)	:arrow_up:
sdk/python/feast/infra/online_stores/datastore.py	88.12% <100.00%> (+8.03%)	:arrow_up:
sdk/python/feast/cli.py	39.11% <0.00%> (-2.48%)	:arrow_down:
setup.py	0.00% <0.00%> (ø)
.../online_stores/contrib/hbase_repo_configuration.py	100.00% <0.00%> (ø)
...k/python/feast/infra/materialization/lambda/app.py	26.66% <0.00%> (ø)
...tores/contrib/trino_offline_store/trino_queries.py	15.05% <0.00%> (ø)
... and 107 more

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[kevjumba]

/lgtm