Update version_5_upgrade.html.markdown

[efeelaiho]

Update version_5_upgrade.html.markdown detailing removal of LOOKER _MODELER

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

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@c2thorn, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 1 file changed, 6 insertions(+))
Terraform Beta: Diff ( 1 file changed, 6 insertions(+))