Fixed several documentation issues

[pri22296]

Fixes #123

[codecov-commenter]

Codecov Report

Merging #124 (a01f8ab) into master (c8de277) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files          11       11           
  Lines        1384     1384           
  Branches      244      244           
=======================================
  Hits         1150     1150           
  Misses        156      156           
  Partials       78       78           

Impacted Files	Coverage Δ
beautifultable/beautifultable.py	83.10% <100.00%> (ø)

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