Update tablegen documentation for WRITE_ARRAY macro.

Originally committed as revision 23824 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/tablegen.txt

@@ -28,9 +28,14 @@ them.
 The printing code typically looks like this:
     write_fileheader();
     printf("static const uint8_t my_array[100] = {\n");
-    write_uint8_array(my_array, 100);
+    write_uint8_t_array(my_array, 100);
     printf("};\n");
 
+This is the more generic form, in case you need to do something special.
+Usually you should instead use the short form:
+    write_fileheader();
+    WRITE_ARRAY("static const", uint8_t, my_array);
+
 write_fileheader() adds some minor things like a "this is a generated file"
 comment and some standard includes.
 tablegen.h defines some write functions for one- and two-dimensional arrays