doc: adjust pr link

Author: efekrskl

doc/api/deprecations.md

@@ -4648,7 +4648,7 @@ successfully before the response closed.
 <!-- YAML
 changes:
   - version: REPLACEME
-    pr-url: https://github.com/nodejs/node/pull/99999
+    pr-url: https://github.com/nodejs/node/pull/64342
     description: Documentation-only deprecation.
 -->