PseudoClass doc duplicate and wrong

[rabbitism]

There are two pieces of docs for PseudoClass https://docs.avaloniaui.net/docs/concepts/pseudo-classes https://docs.avaloniaui.net/docs/reference/styles/pseudo-classes

and this sample is not valid

public static readonly PseudoClass CustomPseudoClass = PseudoClass.Parse(":custom");

// to enable
PseudoClasses.Set(CustomPseudoClass);

// to disable
PseudoClasses.Remove(CustomPseudoClass);

[maxkatz6]

"concepts/pseudo-classes" should be removed I would say.

[MikeCodesDotNET]

Theres a ton of duplication within the docs. It's going to take a bit of work to go through and merge / fix.