Add examples to QLDoc comment

cpp/ql/src/semmle/code/cpp/exprs/Cast.qll

@@ -843,16 +843,17 @@ class ArrayToPointerConversion extends Conversion, @array_to_pointer {
 /**
  * A node representing a temporary object created as part of an expression.
  *
- * This is most commonly seen in the following cases (from [class.temporary]/2):
- * - when binding a reference to a prvalue
- * - when performing member access on a class prvalue
- * - when performing an array-to-pointer conversion or subscripting on an array prvalue
- * - when initializing an object of type std::initializer_list from a braced-init-list
- * - for certain unevaluated operands
- * - when a prvalue that has type other than cv void appears as a discarded-value expression
+ * This is most commonly seen in the following cases:
+ * ```c++
+ * // when binding a reference to a prvalue
+ * const std::string& r = std::string("text");
  *
- * This node will only exist if the object is of class type, and even then only if either the
- * object's initialization or destruction is non-trivial.
+ * // when performing member access on a class prvalue
+ * strlen(std::string("text").c_str());
+ *
+ * // when a prvalue of a type with a destructor is discarded
+ * s.substr(0, 5);  // Return value is discarded but requires destruction
+ * ```
  */
 class TemporaryObjectExpr extends Conversion, @temp_init {
   /** Gets a textual representation of this conversion. */