doc: add missing pr-url

PR-URL: #26753
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

doc/api/deprecations.md

@@ -1906,7 +1906,7 @@ should start using the `async_context` variant of `MakeCallback` or
 <!-- YAML
 changes:
   - version: REPLACEME
-    pr-url:
+    pr-url: https://github.com/nodejs/node/pull/26530
     description: End-of-Life
   - version:
     - v8.12.0