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.
Note that this function prepends a '#' comment marker to
each line of @comment.
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.
Note that this function prepends a '#' comment marker to each line of @comment.