make mat4 consistent with vec4 (#9298)

tutorials/shaders/shader_reference/shading_language.rst

@@ -870,7 +870,7 @@ table of the corresponding types:
 | **mat3**             | **Basis**               |                                                            |
 +----------------------+-------------------------+------------------------------------------------------------+
 | **mat4**             | **Projection**,         | When a Transform3D is used, the w Vector is set to the     |
-| **mat4**             | **Transform3D**         | identity.                                                  |
+|                      | **Transform3D**         | identity.                                                  |
 +----------------------+-------------------------+------------------------------------------------------------+
 | **sampler2D**        | **Texture2D**           |                                                            |
 +----------------------+-------------------------+------------------------------------------------------------+