chore(sdk): update documentation examples

[beroussel]

Update documentation examples to reflect modern way of using the SDK.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.64%. Comparing base (fe1889d) to head (5628435).
Report is 4 commits behind head on master.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   85.64%   85.64%           
=======================================
  Files          16       16           
  Lines         843      843           
  Branches      168      168           
=======================================
  Hits          722      722           
  Misses         78       78           
  Partials       43       43           

Flag	Coverage Δ
unittests	85.64% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
lumapps/api/client.py	95.23% <100.00%> (ø)