some bogus part in gdal_contour manual

[msieczka]

This part looks bogus. Copy/paste error probably:

-s_srs srs def:
           source spatial reference set. The coordinate systems that can be
           passed are anything supported by the
           OGRSpatialReference.SetFromUserInput() call, which includes EPSG
           PCS and GCSes (ie. EPSG:4296), PROJ.4 declarations (as above), or
           the name of a .prf file containing well known text. </dl

[rouault]

Fixed in trunk in r16129 and in branches/1.6 in r16130