Update terminology on exercise 07_Cloud_Ready_Quickstart

The content under Step 1 [https://github.com/adobe/aem-enablement/tree/master/AEMAsACloudService/07_Cloud_Ready_Quickstart#lesson-context](url) is not updated to the AEM SDK terminology as it is used on the official help section: [https://docs.adobe.com/content/help/en/experience-manager-learn/cloud-service/local-development-environment-set-up/aem-runtime.html#download-the-aem-as-a-cloud-service-sdk](url)
This might lead to confusion in the wording and give the idea that here are different quickstarts available.

Open the Step 1 content in 07_Cloud_Ready_Quickstart, starting at the Lesson Context section linked in the issue. Compare its terminology with the official AEM as a Cloud Service SDK help section. Done means the exercise uses the current SDK terminology consistently and does not suggest that separate quickstarts exist.

Written by the indexing model from the issue text.