message: [Doxygen] Document private class members.
  Given that the C++ documentation is meant for LLDB developers it makes
  sense to include private class members in the output.
diff: @@ -303,7 +303,7 @@ EXTRACT_ALL = YES
  # If the EXTRACT_PRIVATE tag is set to YES all private members of a class
  # will be included in the documentation.
  -EXTRACT_PRIVATE = NO
  +EXTRACT_PRIVATE = YES
  # If the EXTRACT_STATIC tag is set to YES all static members of a file
  # will be included in the documentation.
  