Fixed documentation

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@66457 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/raster/rast_to_img_string.c

@@ -31,7 +31,7 @@
 #define DEF_BLU 255
 
 /* \brief Convert a raster map layer into a string with
- *        32Bit ARGB, 24Bit RGB or 8Bit Gray little endian encoding.
+ *        32Bit ARGB, 32Bit RGB or 8Bit Gray little endian encoding.
  * 
  * The raster color table is used for coloring the image. Null values are 
  * marked as transparent. Only little endian encoding is supported.