bug#6814: Documenation: `dired-map-over-marks' needs re-filled

[MON KEY]

Docstring of macro `dired-map-over-marks' needs re-filled.

,---- (documentation 'dired-map-over-marks)
|
| Eval BODY with point on each marked line.  Return a list of BODY's results.
| If no marked file could be found, execute BODY on the current line.
| ARG, if non-nil, specifies the files to use instead of the marked files.
|   If ARG is an integer, use the next ARG (or previous -ARG, if
|    ARG<0) files.  In that case, point is dragged along.  This is
|    so that commands on the next ARG (instead of the marked) files
|    can be chained easily.
|   For any other non-nil value of ARG, use the current file.
| If optional third arg SHOW-PROGRESS evaluates to non-nil,
|   redisplay the dired buffer after each file is processed.
| No guarantee is made about the position on the marked line.
|   BODY must ensure this itself if it depends on this.
| Search starts at the beginning of the buffer, thus the car of the list
|   corresponds to the line nearest to the buffer's bottom.  This
|   is also true for (positive and negative) integer values of ARG.
| BODY should not be too long as it is expanded four times.
|
| If DISTINGUISH-ONE-MARKED is non-nil, then if we find just one marked file,
| return (t FILENAME) instead of (FILENAME).
|
`----

Problem appears in Emacs 23.2 and verified current through Bzr-100972

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