docs: Updates to various code comments / docs

[octokitbot]

"The latest OpenAPI spec resulted in changes to the generated code. Please review, set an applicable commit message, merge, and tag a release as appropriate."

[what-the-diff]

PR Summary

• Update to 'kiota-lock.json' file
  The 'descriptionHash' within the file 'kiota-lock.json' has been adjusted. This is a configuration related change, crucial for overall project setup and operation.

• Enhanced Comment Contents in 'item_copilot_billing_selected_teams_request_builder.go'
  A descriptive content in the comment section of the Post function within the 'item_copilot_billing_selected_teams_request_builder.go' has been updated. This enhances the understanding of the function's operation for future code modifications, ensuring sustainable development.

• Enhanced Comment Contents in 'item_copilot_billing_selected_users_request_builder.go'
  Similarly, there have also been updates in the comment section of the Post function within the 'item_copilot_billing_selected_users_request_builder.go' file. Again, this provides better documentation and clarity about what the function is intended to do.