lib: change hook -> hooks in code comment

PR-URL: nodejs#19053
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/async_hooks.js

@@ -126,7 +126,7 @@ function validateAsyncId(asyncId, type) {
 // emitInitScript.
 function emitInitNative(asyncId, type, triggerAsyncId, resource) {
   active_hooks.call_depth += 1;
-  // Use a single try/catch for all hook to avoid setting up one per iteration.
+  // Use a single try/catch for all hooks to avoid setting up one per iteration.
   try {
     for (var i = 0; i < active_hooks.array.length; i++) {
       if (typeof active_hooks.array[i][init_symbol] === 'function') {