doc: Sync classref with current source

doc/classes/Node2D.xml

@@ -142,10 +142,6 @@
 		<member name="scale" type="Vector2" setter="set_scale" getter="get_scale" default="Vector2( 1, 1 )">
 			The node's scale. Unscaled value: [code](1, 1)[/code].
 		</member>
-		<member name="skew" type="float" setter="set_skew" getter="get_skew" default="0.0">
-		</member>
-		<member name="skew_degrees" type="float" setter="set_skew_degrees" getter="get_skew_degrees" default="0.0">
-		</member>
 		<member name="transform" type="Transform2D" setter="set_transform" getter="get_transform">
 			Local [Transform2D].
 		</member>

doc/classes/RichTextLabel.xml

@@ -50,7 +50,7 @@
 				Clears the tag stack and sets [member bbcode_text] to an empty string.
 			</description>
 		</method>
-		<method name="get_content_height">
+		<method name="get_content_height" qualifiers="const">
 			<return type="int">
 			</return>
 			<description>