fix: remove redundant methods, update docs

[dschach]

Added table for documentation to show methods more clearly
Removed an unused, redundant method (getRecordTypes)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.51% 🎉

Comparison is base (90ea466) 98.48% compared to head (a02fd9b) 100.00%.
Report is 38 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #66      +/-   ##
===========================================
+ Coverage   98.48%   100.00%   +1.51%     
===========================================
  Files           1         1              
  Lines         132       181      +49     
===========================================
+ Hits          130       181      +51     
+ Misses          2         0       -2     

Flag	Coverage Δ
Apex	100.00% <100.00%> (+1.51%)	⬆️

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Files Changed	Coverage Δ
force-app/main/default/classes/RecordTypes.cls	100.00% <100.00%> (+1.51%)	⬆️

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