Fix javadoc comments.

examples/jse/SampleMultiThreaded.java

@@ -11,6 +11,10 @@ import org.luaj.vm2.lib.jse.JsePlatform;
  *  <ul><li>type-related metatables such as LuaNumber.s_metatable are shared by all threads, so are not thread-safe.
  *  </li><li>creating additional threads within a Java element called by lua could result in shared access to globals.
  *  </li></ul>
+ *  
+ * This can be used when all the scripts running can be trusted.  
+ * For examples of how to sandbox scripts in protect against rogue scripts,
+ * see examples/jse/SampLeSandboxed.java.
  */
 public class SampleMultiThreaded {
 

src/core/org/luaj/vm2/LuaString.java

@@ -50,9 +50,9 @@ import org.luaj.vm2.lib.MathLib;
  * <p>
  * When Java Strings are used to initialize {@link LuaString} data, the UTF8 encoding is assumed. 
  * The functions 
- * {@link LuaString#lengthAsUtf8(char[]),
- * {@link LuaString#encodeToUtf8(char[], int, byte[], int)}, and 
- * {@link LuaString#decodeAsUtf8(byte[], int, int) 
+ * {@link #lengthAsUtf8(char[])},
+ * {@link #encodeToUtf8(char[], int, byte[], int)}, and 
+ * {@link #decodeAsUtf8(byte[], int, int)} 
  * are used to convert back and forth between UTF8 byte arrays and character arrays.
  * 
  * @see LuaValue