Doc review changes

[phil-davis]

Minor doc changes.

[codecov]

Codecov Report

Merging #1528 into master will decrease coverage by 0.70%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1528      +/-   ##
==========================================
- Coverage   82.53%   81.83%   -0.71%     
==========================================
  Files          28       28              
  Lines        2560     2560              
  Branches      388      388              
==========================================
- Hits         2113     2095      -18     
- Misses        351      366      +15     
- Partials       96       99       +3     

Impacted Files	Coverage Δ
locust/clients.py	90.19% <0.00%> (-4.91%)	⬇️
locust/runners.py	83.23% <0.00%> (-1.53%)	⬇️
locust/user/task.py	96.75% <0.00%> (-1.09%)	⬇️
locust/stats.py	88.82% <0.00%> (-0.61%)	⬇️

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