[Documentation] Replace broken URL in _serialization.mdx (#13641)

website/docs/usage/101/_serialization.mdx

@@ -4,7 +4,7 @@ progress** – for example, everything that's in your `nlp` object. This means
 you'll have to translate its contents and structure into a format that can be
 saved, like a file or a byte string. This process is called serialization. spaCy
 comes with **built-in serialization methods** and supports the
-[Pickle protocol](https://www.diveinto.org/python3/serializing.html#dump).
+[Pickle protocol](https://docs.python.org/3/library/pickle.html).
 
 > #### What's pickle?
 >