Fixed spelling, line 24 "don'st"

Author: atookey

articles/azure-functions/functions-bindings-register.md

@@ -21,7 +21,7 @@ Consider the following items related to binding extensions:
 
 - Binding extensions aren't explicitly registered in Functions 1.x except when [creating a C# class library using Visual Studio 2019](#local-csharp).
 
-- HTTP and timer triggers are supported by default and don'st require an extension.
+- HTTP and timer triggers are supported by default and don't require an extension.
 
 The following table indicates when and how you register bindings.