Delete false info on solid classes

Earlier I wrote that solids don't have class properties. This is no longer true, they currently extend the same class as point classes. They are functionality identical when it comes to properties. They are set the same way in the resource Class Properties dictionary, and set the same way in code with `if "keyname" in properties: print(properties.keyname)`

docs/class-reference.md

@@ -213,9 +213,7 @@ Entity separates brushes into a node separate from the primary StaticBody, suppo
 - Convex
 - Concave
 
-**Script Class** - The script applied to the entity's root.
-
-Although `QodotFGDSolidClass` is a class you can extend from, this is meant as a Qodot internal to build solid classes. This does not extend QodotEntity, and will not give you access to `properties`.
+**Script Class** - The script applied to the entity's node when built.
 
 # Class Property Data Types