Readme changes

Signed-off-by: abhisbyk <[email protected]>

Author: abhisbyk

OracleDatabase/SingleInstance/extensions/prebuiltdb/README.md

@@ -1,6 +1,6 @@
 # Pre-built Database (prebuiltdb) Extension
 
-This extension extends [the base Oracle Single Instance Database image](../../README.md) in such a way that the resultant image has a pre-built database. So, when a container is started using this extended image, the start-up time is quite fast. 
+This extended image includes an already setup database inside the image itself. Although the image size is larger, the startup time of the container includes only the database startup itself, which makes the container startup duration just a couple of seconds.
 
 The configurable parameters while building this extension are as follows: