Performance Class example code has confusing comments

[ninaforce13]

4.5.1:

Issue description:
The documentation for the Performance class has example code for adding a custom monitor that refers to the newly added monitor as "MyName", but the code seems to be creating "MyMonitor" instead. This may confuse newer coders into thinking "MyName" is some other variable they didn't know about.

func _ready():
	var monitor_value = Callable(self, "get_monitor_value")

	# Adds monitor with name "MyName" to category "MyCategory".
	Performance.add_custom_monitor("MyCategory/MyMonitor", monitor_value)

	# Adds monitor with name "MyName" to category "Custom".
	# Note: "MyCategory/MyMonitor" and "MyMonitor" have same name but different IDs, so the code is valid.
	Performance.add_custom_monitor("MyMonitor", monitor_value)

	# Adds monitor with name "MyName" to category "Custom".
	# Note: "MyMonitor" and "Custom/MyMonitor" have same name and same category but different IDs, so the code is valid.
	Performance.add_custom_monitor("Custom/MyMonitor", monitor_value)

	# Adds monitor with name "MyCategoryOne/MyCategoryTwo/MyMonitor" to category "Custom".
	Performance.add_custom_monitor("MyCategoryOne/MyCategoryTwo/MyMonitor", monitor_value)

func get_monitor_value():
	return randi() % 25

https://docs.godotengine.org/en/stable/classes/class_performance.html#class-performance