Update twisted link in docs (#6666)

Signed-off-by: Matheus Felipe <[email protected]>

Author: matheusfelipeog

pages/en/about/index.mdx

@@ -82,4 +82,4 @@ over your cores.
 [`child_process.fork()`]: https://nodejs.org/api/child_process.html
 [`cluster`]: https://nodejs.org/api/cluster.html
 [event machine]: https://github.com/eventmachine/eventmachine
-[twisted]: https://twistedmatrix.com/trac/
+[twisted]: https://twisted.org/