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. Since 2.6
a group name, or NULL. [allow-none]
a key. [allow-none]
a comment
TRUE if the comment was written, FALSE otherwise
GException on failure.
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. Since 2.6