Fix #4588 error text inline function

[01binary]

Summary

Update error message in babel-plugin-jest-hoist to specify only inline functions are accepted as a second parameter to jest.mock (explicit automock).

We spent some time troubleshooting because it refused to accept any function we gave to it, until I read the code and saw that previously declared functions get seen as "identifiers", only inline/arrow functions are seen as "function".

Test plan

Not familiar with test strategy for error messages, if the builds fail I will modify whatever tests assert on that error message.

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[codecov-io]

Codecov Report

Merging #4593 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4593   +/-   ##
=======================================
  Coverage   55.68%   55.68%           
=======================================
  Files         186      186           
  Lines        6348     6348           
  Branches        3        3           
=======================================
  Hits         3535     3535           
  Misses       2812     2812           
  Partials        1        1

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