Test Title Unification for matchers-test.js in jest-matchers package

[ErnestoLCortez]

Summary

The test file for the matchers has many test titles in different formats. The purpose of this change is to unify the test titles into a consistent format. @DmitriiAbramov

Test Titles Before:

Test Titles After:

Test plan
jest ./packages/jest-matchers/src/__tests__/matchers-test.js
yarn test

[aaronabramov]

thanks @ErnestoLCortez!
circle CI is currently failing because the snapshots for the tests need to be regenerated and added to the repo as well!
you should run jest with -u flag

you can read about snapshot testing here: https://facebook.github.io/jest/docs/snapshot-testing.html#content

[ErnestoLCortez]

Thanks for the input @DmitriiAbramov. I've added the updated snapshot to this PR. Let me know if there is anything else I've missed.

[codecov-io]

Codecov Report

Merging #3153 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3153   +/-   ##
=======================================
  Coverage   60.25%   60.25%           
=======================================
  Files         159      159           
  Lines        6625     6625           
  Branches        3        3           
=======================================
  Hits         3992     3992           
  Misses       2632     2632           
  Partials        1        1

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[aaronabramov]

thanks @ErnestoLCortez!

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