Fix typo of `further`
@@ -37,7 +37,7 @@ import (
// Cache accepts the cache expiration duration.
// If the "expiration" input argument is invalid, <=2 seconds,
// then expiration is taken by the "cache-control's maxage" header.
-// Returns a Handler structure which you can use to customize cache furher.
+// Returns a Handler structure which you can use to customize cache further.
//
// All types of response can be cached, templates, json, text, anything.
//
