Fix typos

[phil-davis]

subset of #1509

[codecov]

Codecov Report

Merging #1512 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1512   +/-   ##
=======================================
  Coverage   81.34%   81.34%           
=======================================
  Files          27       27           
  Lines        2391     2391           
  Branches      368      368           
=======================================
  Hits         1945     1945           
  Misses        353      353           
  Partials       93       93           

Impacted Files	Coverage Δ
locust/clients.py	95.09% <ø> (ø)
locust/contrib/fasthttp.py	85.44% <ø> (ø)
locust/env.py	96.55% <ø> (ø)
locust/event.py	87.50% <ø> (ø)
locust/exception.py	100.00% <ø> (ø)
locust/runners.py	80.81% <0.00%> (ø)
locust/stats.py	89.01% <ø> (ø)
locust/user/task.py	95.67% <ø> (ø)
locust/user/users.py	98.61% <ø> (ø)
locust/web.py	91.48% <ø> (ø)

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[cyberw]

thx