Small fixes to toHaveProperty docs

[RobertJGabriel]

Summary

Hey was just learning about jest (great btw, late to the part) but noticed these small things. I might be wrong but looks like small grammar or extra , :) Sorry If I miss understood

Test plan

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[RobertJGabriel]

CLA signed.

[codecov-io]

Codecov Report

Merging #3878 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3878   +/-   ##
=======================================
  Coverage   57.65%   57.65%           
=======================================
  Files         195      195           
  Lines        6782     6782           
  Branches        6        6           
=======================================
  Hits         3910     3910           
  Misses       2869     2869           
  Partials        3        3

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[aaronabramov]

i'm surprised no one noticed it before! thank you!
i added trailing commas back, since they are a part of our style guide 🙂

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