Power FX example should be `Notify("Hello World")`

[sancarn]

Not sure how the existing Text("Hello World") got through, this just evaluates to "Hello World"... It never prints it anywhere (unless attached to another UI component already).

Instead this should really be Notify("Hello World"):

https://learn.microsoft.com/en-us/power-platform/power-fx/reference/function-showerror

And maybe an additional example for Trace:

https://learn.microsoft.com/en-us/power-platform/power-fx/reference/function-trace