Grammar correction in Mock Function docs

[saylerb]

Simple grammar change in the Mock Function API documentation

Summary

Simple Grammar change, makes it read a little better.

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[codecov-io]

Codecov Report

Merging #8399 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8399      +/-   ##
==========================================
+ Coverage   62.32%   62.34%   +0.01%     
==========================================
  Files         266      266              
  Lines       10733    10736       +3     
  Branches     2614     2610       -4     
==========================================
+ Hits         6689     6693       +4     
+ Misses       3461     3460       -1     
  Partials      583      583

Impacted Files	Coverage Δ
packages/jest-resolve/src/defaultResolver.ts	64.06% <0%> (-4.06%)	⬇️
packages/expect/src/print.ts	95.65% <0%> (-2.08%)	⬇️
packages/jest-config/src/index.ts	12.5% <0%> (+0.55%)	⬆️
packages/jest-snapshot/src/utils.ts	93.33% <0%> (+0.9%)	⬆️

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[jeysal]

Thanks @saylerb!
Quick grep found a few more of these in JestObjectAPI.md files and a comment in jest-environment/src/index.ts, would you mind also fixing it there while we're at it? 😄

[saylerb]

@jeysal Thanks for pointing that out! I found the other occurrences and made the changes, and squashed my commits into a single commit.

[SimenB]

Thanks!

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