lib: fix a typo in lib/timers "read through"

PR-URL: #19666
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>

Author: adispring

lib/timers.js

@@ -66,7 +66,7 @@ const kRefed = Symbol('refed');
 // Therefore, it is very important that the timers implementation is performant
 // and efficient.
 //
-// Note: It is suggested you first read though the lib/internal/linkedlist.js
+// Note: It is suggested you first read through the lib/internal/linkedlist.js
 // linked list implementation, since timers depend on it extensively. It can be
 // somewhat counter-intuitive at first, as it is not actually a class. Instead,
 // it is a set of helpers that operate on an existing object.