Fix multi-line comments for cpp enums (#5345) (#5346)

- fix CSharp comments generation
- fix Python comments generation
- fix Lua comments generation
- fix PHP comments generation
- fix Dart comments generation
- add brief description of Color enum
- add multi-line comments to the Monster:Color

tests/MyGame/Example/Color.cs

@@ -5,12 +5,16 @@
 namespace MyGame.Example
 {
 
+/// Composite components of Monster color.
 [System.FlagsAttribute]
 public enum Color : byte
 {
- Red = 1,
- Green = 2,
- Blue = 8,
+  Red = 1,
+  /// \brief color Green
+  /// Green is bit_flag with value (1u << 1)
+  Green = 2,
+  /// \brief color Blue (1u << 3)
+  Blue = 8,
 };