Fix mpHealth-3.0 => 4.0 in README (#385)

* Fix mpHealth-3.0 => 4.0 in README

* correct the size of the image

README.adoc

@@ -179,7 +179,7 @@ After you make the file changes, Open Liberty automatically reloads its configur
 [INFO] [AUDIT] CWWKZ0009I: The application io.openliberty.guides.getting-started has stopped successfully.
 [INFO] [AUDIT] CWWKG0017I: The server configuration was successfully updated in 0.284 seconds.
 [INFO] [AUDIT] CWWKT0016I: Web application available (default_host): http://foo:9080/health/
-[INFO] [AUDIT] CWWKF0012I: The server installed the following features: [mpHealth-3.0].
+[INFO] [AUDIT] CWWKF0012I: The server installed the following features: [mpHealth-4.0].
 [INFO] [AUDIT] CWWKF0008I: Feature update completed in 0.285 seconds.
 [INFO] [AUDIT] CWWKT0016I: Web application available (default_host): http://foo:9080/
 [INFO] [AUDIT] CWWKZ0003I: The application io.openliberty.guides.getting-started updated in 0.173 seconds.
@@ -368,7 +368,7 @@ Your image should appear in the list of all Docker images:
 [source, role="no_copy"]
 ----
 REPOSITORY                     TAG             IMAGE ID        CREATED         SIZE
-openliberty-getting-started    1.0-SNAPSHOT    85085141269b    21 hours ago    487MB
+openliberty-getting-started    1.0-SNAPSHOT    88173351adfa    2 minutes ago   780MB
 ----
 
 Next, run the image as a container: