Add docs for centerOnLaunch

[zadjii-msft]

See microsoft/terminal#9036

Center on launch

When set to true, the terminal window will auto-center itself on the display it opens on. The terminal will use the "initialPosition" to determine which display to open on.

This interacts with the other launch settings in the following ways:

• "initialPos": x,y, "centerOnLaunch": true, "launchMode": "default": center on the monitor that x,y is on.
• "initialPos": x,y, "centerOnLaunch": true, "launchMode": "maximized": maximized on the monitor that x,y is on (centerOnLaunch adds nothing).
• "initialPos": <omitted>, "centerOnLaunch": true, "launchMode": "default": center on the default monitor.
• "initialPos": <omitted>, "centerOnLaunch": true, "launchMode": "focus": center and enter focus mode on the default monitor.
• "initialPos": <omitted>, "centerOnLaunch": true, "launchMode": "maximized": maximized on the default monitor (centerOnLaunch adds nothing).

Property name: centerOnLaunch

Necessity: Optional

Accepts: true, false

Default value: false

[opbld30]

Docs Build status updates of commit a65dcdc:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/startup.md	✅Succeeded	View

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