Doxygen comment update and PREDEFINED in Doxyfile is properly defined (#5186)

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

jerry-core/ecma/base/ecma-helpers-value.c

@@ -939,8 +939,6 @@ ecma_copy_value_if_not_object (ecma_value_t value) /**< value description */
 
 /**
  * Increase reference counter of a value if it is an object.
- *
- * @return void
  */
 extern inline void JERRY_ATTR_ALWAYS_INLINE
 ecma_ref_if_object (ecma_value_t value) /**< value description */
@@ -953,8 +951,6 @@ ecma_ref_if_object (ecma_value_t value) /**< value description */
 
 /**
  * Decrease reference counter of a value if it is an object.
- *
- * @return void
  */
 extern inline void JERRY_ATTR_ALWAYS_INLINE
 ecma_deref_if_object (ecma_value_t value) /**< value description */
@@ -1140,8 +1136,6 @@ ecma_free_value (ecma_value_t value) /**< value description */
  *   faster for direct values since no function call is performed.
  *   It also increases the binary size so it is recommended for
  *   critical code paths only.
- *
- * @return void
  */
 extern inline void JERRY_ATTR_ALWAYS_INLINE
 ecma_fast_free_value (ecma_value_t value) /**< value description */
@@ -1166,8 +1160,6 @@ ecma_free_value_if_not_object (ecma_value_t value) /**< value description */
 
 /**
  * Free an ecma-value object
- *
- * @return void
  */
 extern inline void JERRY_ATTR_ALWAYS_INLINE
 ecma_free_object (ecma_value_t value) /**< value description */
@@ -1177,8 +1169,6 @@ ecma_free_object (ecma_value_t value) /**< value description */
 
 /**
  * Free an ecma-value number
- *
- * @return void
  */
 extern inline void JERRY_ATTR_ALWAYS_INLINE
 ecma_free_number (ecma_value_t value) /**< value description */