Update Simulator command to DeviceHub for Xcode 27+

[saylee21]

Fixes #13490. Starting with Xcode 27, the Simulator app has been replaced by DeviceHub on macOS.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[gemini-code-assist]

Code Review

This pull request updates the iOS setup documentation, changing the command to open the iOS Simulator to use 'DeviceHub' instead of 'Simulator'. The reviewer correctly pointed out that this change is incorrect and would break the setup instructions, as the application remains named 'Simulator'.

[gemini-code-assist]

The iOS Simulator application on macOS is named Simulator. There is no Xcode 27 (the current version is Xcode 16), and the Simulator has not been renamed to DeviceHub. Changing this command will break the setup instructions for all users.

Suggested change

	$ open -a DeviceHub
	$ open -a Simulator

[saylee21]

Code Review

This pull request updates the iOS setup documentation, changing the command to open the iOS Simulator to use 'DeviceHub' instead of 'Simulator'. The reviewer correctly pointed out that this change is incorrect and would break the setup instructions, as the application remains named 'Simulator'.

This change is correct. Issue #13490 was filed by @vashworth (Flutter team member at Google). Starting with Xcode 27 (currently in beta), the Simulator app has been replaced by DeviceHub on macOS.