Use [codeblock lang=text] more often in class ref

doc/classes/RenderingServer.xml

@@ -2576,7 +2576,7 @@
 			<description>
 				Set the entire data to use for drawing the [param multimesh] at once to [param buffer] (such as instance transforms and colors). [param buffer]'s size must match the number of instances multiplied by the per-instance data size (which depends on the enabled MultiMesh fields). Otherwise, an error message is printed and nothing is rendered. See also [method multimesh_get_buffer].
 				The per-instance data size and expected data order is:
-				[codeblock]
+				[codeblock lang=text]
 				2D:
 				  - Position: 8 floats (8 floats for Transform2D)
 				  - Position + Vertex color: 12 floats (8 floats for Transform2D, 4 floats for Color)