fix: Correct wrong `GET` http method usage in example code

[TaskerJang]

This PR corrects the incorrect usage of the GET method in the example code as described in issue #120. It ensures that methods like leave_joint and campaign do not use the GET method. Additionally, it updates the PUT method to pass values in the request body rather than the path.

Changes made in both Python and Rust code examples.

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:white_check_mark: jopemachine
:x: JJangcoding

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Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[jopemachine]

Thanks!