chore: update aApps description to include end-user use cases

spec/INTRO.md

@@ -18,4 +18,4 @@ They consume software in a private / confidential way based on SaaS model and pa
 They provide cloud software in the ecosystem, essentially enriching the number of use cases that the End User can fulfill by using the ecosystem. It is important to note that the Application Publisher role can be shared with the End User essentially the End User can bring a use case (cloud software) in the ecosystem, pay for its execution and consume it. In a similar way the Application Publisher role can be shared with the Hardware Provider role where the Hardware Provider also brings in the use case / application service. 
 
 ### Autonomous Applications
-They provide platform level services in the ecosystem, the services are metered and they got paid by other application using their services. They have their own wallet and associated DAO governing their updates. They are typically packaged and launched in the network by Application Publishers, who typically is representing their governing DAO. After the initial launch they are no longer dependent on the Application Publishers as they can perform self-updates based on governing DAO decisions.
+They provide end-user or platform services in the ecosystem, the services are metered and they got paid by the end-users or by other applications using the services. They have their own wallet and associated DAO governing their updates. They are typically packaged and launched in the network by Application Publishers, who typically is representing their governing DAO. After the initial launch they are no longer dependent on the Application Publishers as they can perform self-updates based on governing DAO decisions.