Add spurious * in docstrings.

Add spurious * in docstrings.
(bookmark-minibuffer-read-name-map): New var.
(bookmark-set): Use it.  Also pass the default value as it should.
(bookmark-send-edited-annotation): Take no chances with text properties.
(bookmark-insert-current-bookmark): Inline bookmark-insert-buffer-name.
(bookmark-insert-buffer-name): Remove.
(bookmark-buffer-file-name): Signal an error rather than returning nil.