doc: fix --enable-source-maps flag in v12.12.0 changelog

Corrects "--source-map-support" to "--enable-source-maps".

Fixes: #29959
PR-URL: #29960
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

doc/changelogs/CHANGELOG_V12.md

@@ -58,7 +58,7 @@
 * **fs**:
   * Introduce `opendir()` and `fs.Dir` to iterate through directories [#29349](https://github.com/nodejs/node/pull/29349)
 * **process**:
-  * Add source-map support to stack traces by using `--source-map-support`[#29564](https://github.com/nodejs/node/pull/29564)
+  * Add source-map support to stack traces by using `--enable-source-maps`[#29564](https://github.com/nodejs/node/pull/29564)
 * **tls**:
   * Honor `pauseOnConnect` option [#29635](https://github.com/nodejs/node/pull/29635)
   * Add option for private keys for OpenSSL engines [#28973](https://github.com/nodejs/node/pull/28973)