add spacing above netx button in step 3

Author: Memo Döring

tools/VUI Testing Tool/step-by-step/3-connect-vui-to-code.md

@@ -27,4 +27,6 @@ On [step #1](https://github.com/Alexa/alexa-cookbook/blob/master/tools/VUI-Testi
     **Leave "Account Linking" set to "No."** For this skill, we won't be using Account Linking, but you can learn more about [Linking an Alexa User with a User in Your System.](https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/linking-an-alexa-user-with-a-user-in-your-system)
 
     **Leave Permissions for the Device Address unchecked** This sample does not need to ask customers for permission to get the [Device address](https://github.com/alexa/skill-sample-node-device-address-api/blob/master/README.md)
-[![Next step button](https://m.media-amazon.com/images/G/01/mobile-apps/dex/alexa/alexa-skills-kit/tutorials/general/buttons/button_next_testing._TTH_.png)](https://github.com/alexa/alexa-cookbook/blob/master/tools/VUI%20Testing%20Tool/step-by-step/3-connect-vui-to-code.md)
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+[![Next step button](https://m.media-amazon.com/images/G/01/mobile-apps/dex/alexa/alexa-skills-kit/tutorials/general/buttons/button_next_testing._TTH_.png)](https://github.com/alexa/alexa-cookbook/blob/master/tools/VUI%20Testing%20Tool/step-by-step/4-testing.md)