r.plane manual: HTML fix

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@71565 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.plane/r.plane.html

@@ -35,7 +35,7 @@ r.plane myplane45 dip=45 az=90 east=527500.0 north=165000.0 \
 
 <h2>AUTHOR</h2>
 
-Stefan Jäger (1994), University of Heidelberg during a stay at USGS<br>
+Stefan J&auml;ger (1994), University of Heidelberg during a stay at USGS<br>
 Updated to GRASS 5.7 by Michael Barton, Arizona State University<br>
 Full rewrite for GRASS 7 by Glynn Clements