Fix NodeEnvironment import in README.md

[d4vidi]

Summary

A minor yet important syntax fix in the main README.md. 'Had me confused...
Also, aligns it with Jest's environment associated documentation.

Test plan

N/A

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[SimenB]

thanks!

[codecov-io]

Codecov Report

Merging #8933 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8933   +/-   ##
=======================================
  Coverage   64.28%   64.28%           
=======================================
  Files         276      276           
  Lines       11716    11716           
  Branches     2868     2867    -1     
=======================================
  Hits         7532     7532           
  Misses       3552     3552           
  Partials      632      632

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