Enrich document with using getter function over state struct instance

docs/contracts/visibility-and-getters.rst

@@ -189,6 +189,47 @@ to write a function, for example:
 Now you can use ``getArray()`` to retrieve the entire array, instead of
 ``myArray(i)``, which returns a single element per call.
 
+When you have a public state variable of a struct type, calling the
+getter function will return either a tuple containing the struct's members
+(if there are multiple members) or just a single member
+(if the struct has only one member). For example:
+
+.. code-block:: solidity
+
+    // SPDX-License-Identifier: GPL-3.0
+    pragma solidity >=0.4.0 <0.9.0;
+
+    contract structExample {
+        // Struct Definition with single member
+        struct simpleStruct {
+            bool b;
+        }
+
+        // Struct Definition with multiple members
+        struct compleStruct {
+            uint a;
+            bool b;
+        }
+
+        // public state variables
+        simpleStruct public ss;
+        compleStruct public cs;
+
+        // Getter function generated by the compiler
+        /*
+        function ss() public view returns (bool) {
+            return ss.b;
+        }
+        function cs() public view returns (uint, bool) {
+            return (cs.a, cs.b);
+        }
+        */
+
+    }
+
+``this.ss()``'s return type is bool, while ``this.cs()``'s return type is
+a tuple of uint and bool.
+
 The next example is more complex:
 
 .. code-block:: solidity