Quickstart documentation clarification.

[JamesB41]

Quickstart documentation has one bit that's slightly confusing. Just a small edit.

[codecov]

Codecov Report

Merging #1434 into master will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1434      +/-   ##
==========================================
+ Coverage   81.05%   81.27%   +0.21%     
==========================================
  Files          26       26              
  Lines        2344     2344              
  Branches      362      362              
==========================================
+ Hits         1900     1905       +5     
+ Misses        351      348       -3     
+ Partials       93       91       -2     

Impacted Files	Coverage Δ
locust/clients.py	95.09% <0.00%> (+4.90%)	⬆️

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[heyman]

Thanks!