chore(docs): replace HOCs with React.memo

[layershifter]

Cut from #3549.

Replaces neverUpdate and updateForKeys HOCs with React.memo().

[codecov-io]

Codecov Report

Merging #3550 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3550   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files         174      174           
  Lines        2725     2725           
=======================================
  Hits         2720     2720           
  Misses          5        5

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