Replace Tables. by TableOperations. in docs

[dmbates]

• replace vestigial references to Tables.foo by TableOperations.foo
• closes Some uses of Tables. in doc strings should be TableOperations.? #18

[codecov]

Codecov Report

Merging #19 (dd34a37) into main (3753d84) will increase coverage by 1.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   88.68%   89.90%   +1.22%     
==========================================
  Files           1        1              
  Lines         221      218       -3     
==========================================
  Hits          196      196              
+ Misses         25       22       -3     

Impacted Files	Coverage Δ
src/TableOperations.jl	89.90% <ø> (+1.22%)	⬆️

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[quinnj]

Thanks!