groupcache.go: fix misspelling

Author: MaruHyl

groupcache.go

@@ -245,7 +245,7 @@ func (g *Group) load(ctx Context, key string, dest Sink) (value ByteView, destPo
 		// be only one entry for this key.
 		//
 		// Consider the following serialized event ordering for two
-		// goroutines in which this callback gets called twice for hte
+		// goroutines in which this callback gets called twice for the
 		// same key:
 		// 1: Get("key")
 		// 2: Get("key")