Clarify OracleDatabase/README.md

Update OracleDatabase/README.md to clarify that the "Getting started" steps for each database project may vary.

(Also, remove reference to Oracle Linux 7, since some projects use Oracle Linux 8.)

Closes #476

Signed-off-by: Paul Neumann <[email protected]>

Author: PaulNeumann

OracleDatabase/README.md

@@ -1,13 +1,15 @@
 # Oracle Database Vagrant projects
 
-This directory contains Vagrant build files to provision an Oracle Database automatically, using Vagrant, an Oracle Linux 7 box and a shell script.
+This directory contains Vagrant build files to provision an Oracle Database automatically, using Vagrant, an Oracle Linux box and a shell script.
 
 ## Prerequisites
 
 Read the [prerequisites in the top level README](../README.md#prerequisites) to set up Vagrant with either VirtualBox or KVM.
 
 ## Getting started
 
+(These steps may vary slightly for each project. **For more information, please check the individual README within each directory!**)
+
 1. Clone this repository `git clone https://github.com/oracle/vagrant-projects`
 2. Change into the desired version directory
 3. Download the installation zip file(s) from OTN into this directory - first time only:
@@ -16,8 +18,6 @@ Read the [prerequisites in the top level README](../README.md#prerequisites) to
 5. Connect to the database.
 6. You can shut down the VM via the usual `vagrant halt` and the start it up again via `vagrant up`.
 
-**For more information please check the individual README within each directory!**
-
 ## Acknowledgements
 
 Based on: