Updated Purity version to 6.5.1

Author: Soumya Maitra

articles/operator-nexus/howto-platform-prerequisites.md

@@ -227,7 +227,7 @@ Terminal Server has been deployed and configured as follows:
    - Installation Address:
    - FIC/Rack/Grid Location:
 4. Data provided to the operator and shared with storage array technician, which will be common to all installations:
-   - Purity Code Level: 6.1.14
+   - Purity Code Level: 6.5.1
    - Array Time zone: UTC
    - DNS Server IP Address: 172.27.255.201
    - DNS Domain Suffix: not set by operator during setup