i.atcorr: fix typo in manual

          (merge https://trac.osgeo.org/grass/changeset/65456 from trunk)


git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@65457 15284696-431f-4ddb-bdfa-cd5b030d7da7

imagery/i.atcorr/i.atcorr.html

@@ -175,7 +175,7 @@ the ascendant node at equator</td>
 </tr>
 
 <tr>
-<td>17</td>
+<td>18</td>
 <td><b>LandSat 8</b></td>
 <td>enter month,day,hh.ddd,long.,lat. *</td>
 </tr>