change the intro in layer/__init__.py

MatGL supports more different GNN architectures and the intro needs to be changed.

Signed-off-by: Tsz Wai Ko <[email protected]>

src/matgl/layers/__init__.py

@@ -1,4 +1,4 @@
-"""This package implements the layers for M*GNet."""
+"""This package implements the layers for different Graph Neural Networks."""
 
 from __future__ import annotations