chore: Update offline and online store docs

[kevjumba]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #3048 (bb86857) into master (0ed1a63) will increase coverage by 8.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3048      +/-   ##
==========================================
+ Coverage   67.44%   75.93%   +8.48%     
==========================================
  Files         169      203      +34     
  Lines       14936    16839    +1903     
==========================================
+ Hits        10074    12786    +2712     
+ Misses       4862     4053     -809     

Flag	Coverage Δ
integrationtests	67.29% <ø> (-0.15%)	⬇️
unittests	58.13% <ø> (?)

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

Impacted Files	Coverage Δ
.../feature_repos/universal/online_store/cassandra.py	42.85% <0.00%> (ø)
...s/contrib/trino_offline_store/connectors/upload.py	8.97% <0.00%> (ø)
...tores/contrib/trino_offline_store/trino_queries.py	15.05% <0.00%> (ø)
...b/cassandra_online_store/cassandra_online_store.py	2.63% <0.00%> (ø)
...line_stores/contrib/postgres_repo_configuration.py	100.00% <0.00%> (ø)
...ores/contrib/trino_offline_store/trino_type_map.py	6.66% <0.00%> (ø)
...s/contrib/postgres_offline_store/tests/__init__.py	100.00% <0.00%> (ø)
...s/contrib/trino_offline_store/tests/data_source.py	17.64% <0.00%> (ø)
...k/python/feast/infra/materialization/lambda/app.py	26.66% <0.00%> (ø)
.../online_stores/contrib/hbase_online_store/hbase.py	37.25% <0.00%> (ø)
... and 98 more

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[adchia]

i think this is actually not a good example since the pytest plugin uses the offline store. Maybe sync and copy the cassandra one?

[kevjumba]

fixed

[adchia]

is this right? seems like it should be using the cassandra plugins?

[kevjumba]

fixed

[kevjumba]

It works with the module around the online stores but I can also just plugin the actual file

[adchia]

/lgtm

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