typos; html

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@46806 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster3d/raster3dintro.html

@@ -14,11 +14,12 @@
 <h2>3D Raster data (voxel) in GRASS GIS</h2>
 
 GRASS GIS raster3d maps use the same coordinate system as
-2d raster maps (row count from north to south) with an additional z dimension (depth)
-coutning from bottom to top. The upper left corner (NW) is the origin of the volume. 
+2D raster maps (row count from north to south) with an additional z dimension (depth)
+counting from bottom to top. The upper left corner (NW) is the origin of the volume. 
 Volumes are stored using a tile cache based approach. This allows abritrary read 
 and write operations in the created volume. The size of the tiles can be specified at import time
-with r3.in.ascii or the data can be retiles using r3.retile after import or creation.
+with <a href="r3.in.ascii.html">r3.in.ascii</a> or the data can be retiled using
+<a href="r3.retile.html">r3.retile</a> after import or creation.
 
 
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