doc: remove --expose-gc flag from CLI documentation

PR-URL: #58909
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: dario-piotrowicz

doc/api/cli.md

@@ -1377,25 +1377,6 @@ added:
 
 Enable experimental support for the worker inspection with Chrome DevTools.
 
-### `--expose-gc`
-
-<!-- YAML
-added:
-  - v22.3.0
-  - v20.18.0
--->
-
-> Stability: 1 - Experimental. This flag is inherited from V8 and is subject to
-> change upstream.
-
-This flag will expose the gc extension from V8.
-
-```js
-if (globalThis.gc) {
-  globalThis.gc();
-}
-```
-
 ### `--force-context-aware`
 
 <!-- YAML