Language in webview API differs from elsewhere

[Tyriar]

#48453

Many of the new APIs pose questions in their JS Doc:

		/**
		 * Should the find widget be enabled in the panel?
		 *
		 * Defaults to false.
		 */

Typically we use a statement like this:

		/**
		 * Controls if a cancel button should show to allow the user to
		 * cancel the long running operation.  Note that currently only
		 * `ProgressLocation.Notification` is supporting to show a cancel
		 * button.
		 */
		cancellable?: boolean;

[Tyriar]

This also affects WebviewOptions