doc: update change log

Signed-off-by: Daeyeon Jeong [email protected]

Author: daeyeon

doc/api/process.md

@@ -1714,6 +1714,11 @@ that started the Node.js process. Symbolic links, if any, are resolved.
 
 <!-- YAML
 added: v0.1.13
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/43716
+    description: Only accepts a code of type number, or of type string if it
+                 represents an integer.
 -->
 
 * `code` {integer|string|null|undefined} The exit code. For string type, only