Update link for reading uninitialized memory in Rust

Author: rcseacord

src/coding-guidelines/values.rst

@@ -31,7 +31,7 @@ Values
       :status: draft
 
       Rust’s memory model requires that all bytes are initialized before a typed value may be constructed.
-      Reading uninitialized memory:
+      `Reading uninitialized memory <https://doc.rust-lang.org/nomicon/uninitialized.html>`_:
 
       - creates undefined behavior for most types,
       - may violate niche or discriminant validity,