docs: added an example how to use RxPY and sync batching

[bednar]

Closes #198

Proposed Changes

• added an example how to use RxPY and sync batching
• added examples/README.md with description for examples
• fixed generating usage doc
  

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• pytest tests completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov]

Codecov Report

Merging #202 (4909bb2) into master (75f4579) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #202   +/-   ##
=======================================
  Coverage   89.93%   89.93%           
=======================================
  Files          26       26           
  Lines        1967     1967           
=======================================
  Hits         1769     1769           
  Misses        198      198           

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