Clarify array and struct uniforms being supported in Shading language

Author: Calinou

tutorials/shaders/shader_reference/shading_language.rst

@@ -91,6 +91,10 @@ Most GLSL ES 3.0 datatypes are supported:
 |                        | Only supported in Compatibility/Android platform.                               |
 +------------------------+---------------------------------------------------------------------------------+
 
+These types can also be put inside :ref:`arrays <doc_shading_language_arrays>`
+or :ref:`structs <doc_shading_language_structs>`, which are also usable as uniforms,
+function parameters, or return values.
+
 .. warning::
 
     Local variables are not initialized to a default value such as ``0.0``. If
@@ -255,6 +259,8 @@ precisions. Refer to the documentation of the target architecture for further
 information. In many cases, mobile drivers cause inconsistent or unexpected
 behavior and it is best to avoid specifying precision unless necessary.
 
+.. _doc_shading_language_arrays:
+
 Arrays
 ------
 
@@ -411,6 +417,8 @@ Alternatively, this can be done by using the ``uint(x)`` built-in conversion fun
     uint a = 1u;
     uint b = uint(1);
 
+.. _doc_shading_language_structs:
+
 Structs
 -------
 
@@ -1104,23 +1112,23 @@ method on a node that inherits from :ref:`class_GeometryInstance3D`:
 
 When using per-instance uniforms, there are some restrictions you should be aware of:
 
-- **Per-instance uniforms do not support textures or arrays**, only regular scalar and vector types. 
+- **Per-instance uniforms do not support textures or arrays**, only regular scalar and vector types.
 
 .. note::
 
     Due to GLSL limitations, you cannot directly index a texture array
     using a per-instance uniform. Sampler arrays can only be indexed by
     compile-time constant expressions.
-   
+
     As a workaround, pass a texture array as a regular uniform and the
     desired texture index as a per-instance uniform. Then use a ``switch``
     statement to select the texture:
-   
+
    .. code-block:: glsl
-   
+
       uniform sampler2D texture_array[4];
       instance uniform int texture_index;
-      
+
       void fragment() {
           vec4 color;
           switch (texture_index) {
@@ -1137,7 +1145,7 @@ When using per-instance uniforms, there are some restrictions you should be awar
                   color = texture(texture_array[3], UV);
                   break;
           }
-          
+
           COLOR = color;
       }