libinit: +ZSTD in the doc

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@72784 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/variables.html

@@ -111,9 +111,8 @@ PERMANENT
   <dd>[libraster]<br>
     the compression method for new raster maps can be set with the
     environment variable GRASS_COMPRESSOR. Supported methods are RLE, 
-    ZLIB, LZ4, and BZIP2 if GRASS has been compiled with BZIP2 support. 
-    The default is ZLIB which can be changed with e.g. 
-    <tt>GRASS_COMPRESSOR=LZ4</tt></dd>
+    ZLIB, LZ4, BZIP2, and ZSTD. The default is ZLIB which can be 
+    changed with e.g. <tt>GRASS_COMPRESSOR=ZSTD</tt></dd>
 
   <dt>GRASS_DB_ENCODING</dt>
   <dd>[various modules, wxGUI]<br>