test: fix typo in comment

PR-URL: nodejs#36312
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-fs-options-immutable.js

@@ -44,7 +44,7 @@ if (common.canCreateSymLink()) {
   fs.appendFile(fileName, 'ABCD', options, common.mustCall(errHandler));
 }
 
-if (!common.isIBMi) { // IBMi does not suppport fs.watch()
+if (!common.isIBMi) { // IBMi does not support fs.watch()
   const watch = fs.watch(__filename, options, common.mustNotCall());
   watch.close();
 }