Describe the issue:
-------------------
IPv6 is not yet supported for external ODF, IPv6 is only supported for internal ODF from 4.12. And also from ODF 4.14, IPv6 for external ODF is in dev-preview[1]

Our doc mention, ODF supports IPv6 but this is only true for internal ODF, this misguides the users/customer's. So we need explicitly mention about internal and external ODF suportability.

[1] https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.14/html-single/4.14_release_notes/index#ipv6_support_for_external_mode

Suggestions for improvement:
----------------------------

Explicitly mention about internal and external ODF suportability for IPv6

Document URL:
-------------
ODF 4.14
https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.14/html-single/planning_your_deployment/index#ipv6-support_rhodf

Chapter/Section Number and Title:
---------------------------------

ODF 4.14 -> Chapter 8.1. IPv6 support

Product Version:
----------------
ODF 4.14

Any other versions of this document that also needs this update:
----------------------------------------------------------------

ODF 4.13 -> Chapter 8.1. IPv6 support
https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.13/html-single/planning_your_deployment/index#ipv6-support_rhodf

ODF 4.12 -> Chapter 7.6.1. IPv6 support
https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.12/html-single/planning_your_deployment/index#ipv6-support_rhodf