Docs update, remove malloc from limitations list

docs/index.rst

@@ -47,7 +47,6 @@ Features and limitations
 
 **Limitations**
 
-#) User must provide callbacks when decoding arrays or strings without maximum size. Malloc support could be added as a separate module.
 #) Some speed has been sacrificed for code size.
 #) Encoding is focused on writing to streams. For memory buffers only it could be made more efficient.
 #) The deprecated Protocol Buffers feature called "groups" is not supported.