Update Builds.json (#26733)

Author: pauld-msft

specification/app/resource-manager/Microsoft.App/preview/2023-08-01-preview/Builds.json

@@ -315,7 +315,7 @@
           "x-ms-identifiers": [
             "name"
           ],
-          "description": "List of environment variables to be passed to the build and application runtime."
+          "description": "List of environment variables to be passed to the build."
         },
         "preBuildSteps": {
           "type": "array",