updated docs for button()'s permission lambda

[MrValdez]

I'm unsure about other Python versions, but under Python 3.13, the doc for button()'s permission doesn't work. The following error is the reason.

TypeError: Admin.<lambda>() got an unexpected keyword argument 'handler'

The fix update is to add handler to the lambda.

[gemini-code-assist]

Summary of Changes

Hello @MrValdez, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a TypeError that occurred in Python 3.13 when using the button() permission lambda example provided in the documentation. The fix involves updating the example to correctly include the handler argument in the lambda function signature, ensuring the documentation reflects functional and accurate code for users.

Highlights

• Documentation Fix: Corrected the button() permission lambda in the documentation to include the handler argument, resolving a TypeError encountered in Python 3.13.

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[gemini-code-assist]

Code Review

This pull request updates an example in the documentation for the @button decorator to reflect the correct signature for the permission lambda, which now requires a handler argument. While the change itself is correct and addresses the TypeError described, it is incomplete. Other parts of the documentation file, including the parameter's description and another code example, have not been updated, leading to inconsistencies. I've added a comment to highlight the specific locations that also require this update.