Update documentation for schedule_task parameters in TaskSet (task.py)

[kmels]

The parameters "args" and "kwargs" were removed in commit 82c2d6a. However they still show in the latest documentation https://docs.locust.io/en/latest/api.html?highlight=schedule_task#locust.TaskSet.schedule_task

[codecov]

Codecov Report

Merging #1565 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1565      +/-   ##
==========================================
- Coverage   82.17%   82.14%   -0.04%     
==========================================
  Files          28       28              
  Lines        2570     2570              
  Branches      392      392              
==========================================
- Hits         2112     2111       -1     
  Misses        367      367              
- Partials       91       92       +1     

Impacted Files	Coverage Δ
locust/user/task.py	95.67% <ø> (-2.17%)	⬇️
locust/stats.py	90.08% <0.00%> (+0.20%)	⬆️
locust/runners.py	83.11% <0.00%> (+0.37%)	⬆️

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[cyberw]

thx