Places a comment above @key from @group_name. If @key is %NULL then @comment will be written above @group_name. If both @key and @group_name are %NULL, then @comment will be written above the first group in the file.
a group name, or %NULL
a key
a comment
Return: %TRUE if the comment was written, %FALSE otherwise
GException on failure.
2.6
See Implementation
Places a comment above @key from @group_name. If @key is %NULL then @comment will be written above @group_name. If both @key and @group_name are %NULL, then @comment will be written above the first group in the file.