<b><kbd>{modified [by] [file=...] [realfile=...]}</kbd></b>: <br>

Returns a date, or username indicating the last modification of the
specified file (if no file is specified, the current file is used). If
by is specified, the tag takes the same argument as the 'user' tag
(<user help>) in addition to the normal ones. If 'by' is not
specified, the tag takes these arguments in addition to the normal ones:
<p>
<date-attributes>
