[DOC] The common Azure blob storage configuration can't work on IPv6

Description of problem:

The common Azure blob storage configuration which can work on IPv4  can't work on IPv6. 

Version-Release number of selected component (if applicable):

quay 3.8.0

How reproducible:

always

Steps to Reproduce:
1.  deploy quay 3.8 on IPv6 single stack environment
2.  configure Azure blob storage in config-tool UI
3. validate the configuration

Actual results:

Additional info:

The same configuration on IPv4

The  endpoint of Azure blob storage doesn't support IPv6

$ host whusc0.blob.core.windows.net
whusc0.blob.core.windows.net is an alias for blob.blz23prdstr04a.store.core.windows.net.
blob.blz23prdstr04a.store.core.windows.net has address 52.239.221.36