docs: restore the window if it is minimized

[RSS1102]

Description

• What does this PR change? Give us a brief description.
  

In actual situations, when the app main is minimized to the tray, left-click the tray icon and you need to cancel the minimization before it can be displayed and the window focus can be set.

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D:\GithubDesktop\tauri-docs\packages\tauri\examples\api\src-tauri\src\tray.rs
D:\GithubDesktop\tauri-docs\packages\plugins-workspace\examples\api\src-tauri\src\tray.rs

I don't know if this also needs to be changed for the example?

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