doc: fix typo in globals.md

Use apostrophe for possessive.

Signed-off-by: Daeyeon Jeong daeyeon.dev@gmail.com

PR-URL: nodejs#43365
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: daeyeon

doc/api/globals.md

@@ -60,7 +60,7 @@ changes:
     description: Added the new optional reason argument.
 -->
 
-* `reason` {any} An optional reason, retrievable on the `AbortSignal`s
+* `reason` {any} An optional reason, retrievable on the `AbortSignal`'s
   `reason` property.
 
 Triggers the abort signal, causing the `abortController.signal` to emit