Update account docs to not to pass PublicKey as an argument

[SupunS]

Closes #965

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #967 (f189fef) into master (d979afe) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #967   +/-   ##
=======================================
  Coverage   75.43%   75.43%           
=======================================
  Files         268      268           
  Lines       32827    32827           
=======================================
  Hits        24762    24762           
  Misses       6929     6929           
  Partials     1136     1136           

Flag	Coverage Δ
unittests	75.43% <ø> (ø)

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