docs(features): update shell page

[dklassic]

What kind of changes does this PR include?

• New or updated content
  • Update /features/shell page

Description

• Closes Create Shell guide #1488
• What does this PR change? Give us a brief description.
  • Update /features/shell page
  • Sneakily fixing a missing word in /features/window-state page

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[vasfvitor]

I just recalled that there is the scope configuration. Speaking of which we may need to revise a few guides to make sure we didn't forget to explain how to configure scope.

https://beta.tauri.app/references/v2/acl/#scopes

[dklassic]

Closing this in favor of #1951