doc: fix historical experimental fetch flag

PR-URL: #51506
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/globals.md

@@ -450,7 +450,7 @@ added: v17.5.0
 changes:
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41811
-    description: No longer behind `--experimental-global-fetch` CLI flag.
+    description: No longer behind `--experimental-fetch` CLI flag.
 -->
 
 > Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
@@ -465,7 +465,7 @@ added: v17.6.0
 changes:
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41811
-    description: No longer behind `--experimental-global-fetch` CLI flag.
+    description: No longer behind `--experimental-fetch` CLI flag.
 -->
 
 > Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
@@ -499,7 +499,7 @@ added: v17.5.0
 changes:
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41811
-    description: No longer behind `--experimental-global-fetch` CLI flag.
+    description: No longer behind `--experimental-fetch` CLI flag.
 -->
 
 > Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
@@ -672,7 +672,7 @@ added: v17.5.0
 changes:
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41811
-    description: No longer behind `--experimental-global-fetch` CLI flag.
+    description: No longer behind `--experimental-fetch` CLI flag.
 -->
 
 > Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
@@ -687,7 +687,7 @@ added: v17.5.0
 changes:
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41811
-    description: No longer behind `--experimental-global-fetch` CLI flag.
+    description: No longer behind `--experimental-fetch` CLI flag.
 -->
 
 > Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]