made toHaveBeenCalled example clearer

[rachelfranklin1]

I added a function definition to give greater context to weird octopus reference ¯_(ツ)_/¯

As a junior developer that is new to Jest, I found this example really confusing. To make it clearer (the octopus reference really threw me off), I added a simple function to add context.

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[SimenB]

Thanks for the PR! Good call on adding the actual function there

We have multiple versions of these docs, could you update the other ones as well?

[rachelfranklin1]

Thanks @SimenB - I've updated the spelling and added the updated code example to the other expectAPI docs also.

[codecov-io]

Codecov Report

Merging #8179 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8179   +/-   ##
=======================================
  Coverage   62.33%   62.33%           
=======================================
  Files         265      265           
  Lines       10465    10465           
  Branches     2543     2542    -1     
=======================================
  Hits         6523     6523           
  Misses       3359     3359           
  Partials      583      583

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[SimenB]

Awesome, thanks!

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