chore(sdk): update references to LumApps API docs

[beroussel]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.01%. Comparing base (59f9d0b) to head (d8a0f4f).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   86.01%   86.01%           
=======================================
  Files          16       16           
  Lines         851      851           
  Branches      169      169           
=======================================
  Hits          732      732           
  Misses         77       77           
  Partials       42       42           

Flag	Coverage Δ
unittests	86.01% <ø> (ø)

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Files with missing lines	Coverage Δ
lumapps/api/client.py	95.23% <ø> (ø)