Add test case for readonly property

Author: sandipklevu

Magento2/Tests/Commenting/ClassPropertyPHPDocFormattingUnitTest.inc

@@ -200,4 +200,14 @@ class correctlyFormattedClassMemberDocBlock
      * @deprecated This property will be removed in version 1.0.0 without replacement
      */
     protected string $deprecatedWithKeyword;
+
+    /**
+     * @var string
+     */
+    protected readonly string $readOnlyString;
+
+    /**
+     * @var int
+     */
+    protected readonly int $readOnlyInteger;
 }