documentation for examples are added

[Arundas666]

Describe the change
This PR adds documentation to the examples in the examples/ folder. The documentation provides clear explanations of each example's functionality and usage, making it easier for users to understand and utilize the examples.

Provide OpenAI documentation link
No changes to the OpenAI API were made, so no documentation link is necessary.

Describe your solution
The documentation was added as comments within the example files. The goal was to make the examples more accessible to users by providing context and instructions directly in the code and accompanying documents.

Tests
The changes consist solely of documentation updates, so no new tests were added. However, the examples themselves were run to ensure they function as expected.

Additional context
This PR does not introduce any functional changes to the codebase, only documentation improvements. This should make it easier for developers to use the examples provided.

Issue: #XXXX

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.01%. Comparing base (774fc9d) to head (1c25e4b).
Report is 47 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #842      +/-   ##
==========================================
+ Coverage   98.46%   99.01%   +0.55%     
==========================================
  Files          24       26       +2     
  Lines        1364     1418      +54     
==========================================
+ Hits         1343     1404      +61     
+ Misses         15        8       -7     
  Partials        6        6              

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