(docs): clarify clear vs reset mocks

[jackfranklin]

Summary

As discussed in #2972 (comment), this PR tries to clarify the behaviour of resetMocks vs clearMocks.

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[jackfranklin]

Just signed the CLA :)

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[codecov-io]

Codecov Report

Merging #3579 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3579   +/-   ##
=======================================
  Coverage   62.39%   62.39%           
=======================================
  Files         181      181           
  Lines        6646     6646           
  Branches        6        6           
=======================================
  Hits         4147     4147           
  Misses       2496     2496           
  Partials        3        3

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[cpojer]

Thank you!

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