Typo fix.

Changed import style.

types/locks/index.d.ts

@@ -8,7 +8,7 @@
 export class Mutex {
     /** Construct a new mutex lock. */
     constructor();
-    /** Flag indicating whther the lock is currently taken. */
+    /** Flag indicating whether the lock is currently taken. */
     isLocked: boolean;
     /** Take the lock. */
     lock(callback: () => void): void;

types/locks/locks-tests.ts

@@ -1,4 +1,4 @@
-import * as locks from "locks";
+import locks = require("locks");
 
 // Mutex
 const mutex: locks.Mutex = new locks.Mutex();