Updating docs to use the term lookup tables instead of reference tables

[dr-rodriguez]

Updating documentation to use the term lookup tables instead of reference tables.

The variable names in the code are left as reference to avoid breaking changes.

[kelle]

I think we should add a new argument lookup_tables and rename the example in the init.py to LOOKUP_TABLES. I'm ok with keeping the old argument reference_tables for legacy, but both should be usable. If you want this PR to just focus on docs, that's fine, but if we're gonna make the change, might as well make the change!

[dr-rodriguez]

This should make it so you can use either reference_tables or lookup_tables for the parameter, with the former having a deprecation warning.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.37%. Comparing base (24a4749) to head (8f2aeb3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #102   +/-   ##
=======================================
  Coverage   95.36%   95.37%           
=======================================
  Files          10       10           
  Lines        1122     1124    +2     
=======================================
+ Hits         1070     1072    +2     
  Misses         52       52           

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