chore: ROOT-204: update readmes for v2.x examples

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• https://github.com/HumanSignal/label-studio-sdk/pull/638

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 79.69%. Comparing base (99f457e) to head (c9fafbd). :warning: Report is 181 commits behind head on develop. :white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8596       +/-   ##
============================================
+ Coverage    67.42%   79.69%   +12.27%     
============================================
  Files          782      238      -544     
  Lines        60005    21537    -38468     
  Branches     10161        0    -10161     
============================================
- Hits         40458    17164    -23294     
+ Misses       19544     4373    -15171     
+ Partials         3        0        -3     

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