doc: assign missed deprecation code

Refs: #26982

PR-URL: #27164
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

Author: richardlau

doc/api/deprecations.md

@@ -2299,8 +2299,8 @@ Please use the publicly documented [`timeout.refresh()`][] instead.
 If unreferencing the timeout is necessary, [`timeout.unref()`][] can be used
 with no performance impact since Node.js 10.
 
-<a id="DEP0XXX"></a>
-### DEP0XXX: ChildProcess._channel
+<a id="DEP0129"></a>
+### DEP0129: ChildProcess._channel
 <!-- YAML
 changes:
   - version: REPLACEME