improve wording across diff

test/Common/HttpApiHandlerTests.cs

@@ -42,7 +42,7 @@ public void CreateCheckStatusResponse_Throws_Exception_When_NotificationUrl_Miss
             var httpApiHandler = new HttpApiHandler(GetTestExtension(options), null);
             var ex = Assert.Throws<InvalidOperationException>(() => httpApiHandler.CreateCheckStatusResponse(new HttpRequestMessage(), string.Empty, null));
             string errorMessage = "Webhooks are not configured. This may occur if the environment variable `WEBSITE_HOSTNAME` is not set (should be automatically set for Azure Functions). " +
-             "Try setting it to <ip-address>:<port> as the value, where <ip-address>:<port> refers to the address that can be used to reach your function app from outside, or the DNS name of the app.";
+            "Try setting it to the appropiate URI to reach your app. For example: the DNS name of the app, or a value of the form <ip-address>:<port>.";
             Assert.Equal(errorMessage, ex.Message);
         }