chore: Spell white space instead of whitespace

[alexandear]

Change whitespace to white space. We can't verify this with misspell, see golangci/misspell#38

Originally posted by @Not-Dhananjay-Mishra in #4042 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.08%. Comparing base (cc0abe8) to head (bef2aca).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4047   +/-   ##
=======================================
  Coverage   94.08%   94.08%           
=======================================
  Files         207      207           
  Lines       19217    19217           
=======================================
  Hits        18081    18081           
  Misses        938      938           
  Partials      198      198           

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.