[Docs] Update docs regarding "datetimetz" type

[phansys]

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Q	A
Type	bug
Fixed issues	n/a

Summary

Related to #6006. BTW, I think we should rename known-vendor-issues.rst to something like vendor-specific-caveats.rst or similar, because many of the behaviors described there are not necessarily issues.

ToDo

• [x] Determine if we should take this as a fix and target 3.6.x;
• [x] Check why the docs state that DB2 support UTC offsets. <- Confirmed that it is not working.

[SenseException]

Shouldn't this target 3.7.x too?

[phansys]

Shouldn't this target 3.7.x too?

At first sight, I think no, as it fixes some wrong assumptions.

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 90 days, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 7 days. If you want to continue working on it, please leave a comment.

[phansys]

IMO, this is still relevant.

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 90 days, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 7 days. If you want to continue working on it, please leave a comment.

[greg0ire]

@phansys can you please address the conflict? :pray:

[phansys]

I'm currently AFK, but I'll be rebasing today. Thank you!

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 90 days, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 7 days. If you want to continue working on it, please leave a comment.