error in documentation about port drivers

[Mariano Guerra]

I was following this documentation and I had problems making it work:

http://www.erlang.org/doc/tutorial/c_portdriver.html

the problem is:

unix> gcc -o exampledrv -fpic -shared complex.c port_driver.c

should be

unix> gcc -o example_drv.so -fpic -shared complex.c port_driver.c

that's all