documentation update for getTables

[muraliQlogic]

Fixes #91

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

Merging #311 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #311   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines        1281   1281           
=====================================
  Hits         1281   1281

Impacted Files	Coverage Δ
src/instance.js	100% <ø> (ø)	⬆️

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