Add updated examples for tiers

[KonSola5]

This PR adds examples for 1.21.1 syntax for custom tool and armor tiers.

[KonSola5]

		// How many armor points does each piece of armor contribute. You can also use 'body' to create a piece of armor
		// which gives armor points regardless of where it is worn.

There is a mistake here: body is for armor that horses (or dogs in later versions) wear.