Update functions-reference.md

Author: alexbuckgit

articles/azure-functions/functions-reference.md

@@ -6,7 +6,7 @@ ms.topic: conceptual
 ms.date: 10/12/2017
 
 ---
-# Azure Functions developers guide
+# Azure Functions developer guide
 In Azure Functions, specific functions share a few core technical concepts and components, regardless of the language or binding you use. Before you jump into learning details specific to a given language or binding, be sure to read through this overview that applies to all of them.
 
 This article assumes that you've already read the [Azure Functions overview](functions-overview.md).