Fix missing parameter in the example
Fix missing parameter in the example

Fix missing `err_code` parameter to `duk_push_error_object_va` in the example. Use `DUK_ERR_TYPE_ERROR` like in the `duk_push_error_object()` example.

svaarala/duktape,markand/duktape,svaarala/duktape,jmptrader/duktape,jmptrader/duktape,jmptrader/duktape,svaarala/duktape,jmptrader/duktape,harold-b/duktape,markand/duktape,markand/duktape,markand/duktape,harold-b/duktape,markand/duktape,harold-b/duktape,svaarala/duktape,jmptrader/duktape,markand/duktape,svaarala/duktape,harold-b/duktape,jmptrader/duktape,svaarala/duktape,svaarala/duktape,harold-b/duktape,markand/duktape,markand/duktape,svaarala/duktape,jmptrader/duktape,jmptrader/duktape,harold-b/duktape,jmptrader/duktape,harold-b/duktape,jmptrader/duktape,harold-b/duktape,svaarala/duktape,markand/duktape,harold-b/duktape,harold-b/duktape,markand/duktape