Add troubleshooting steps for EAFNOSUPPORT

What does this MR do?

Adds a doc entry to list of common install issues for the below error:

Address family not supported by protocol - socket(2)

This error typically occurs as a result of a DNS misconfiguration combined with IPv6 being disabled at the operating system level

For anything in this list which will not be completed, please provide a reason in the MR discussion

Merge Request Title, and Description are up to date, accurate, and descriptive
MR targeting the appropriate branch
MR has a green pipeline on GitLab.com
Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
trigger-package has a green pipeline running against latest commit

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