Version 5 Upgrade docs updated for flex_template_job, node_group, and import format regex

[NickElliot]

flex_template: #9031
node_group: #9044
import regex: #8913

Release Note Template for Downstream PRs (will be copied)

[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, 28 insertions(+), 1 deletion(-))
Terraform Beta: Diff ( 1 file changed, 28 insertions(+), 1 deletion(-))

[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, 29 insertions(+), 1 deletion(-))
Terraform Beta: Diff ( 1 file changed, 29 insertions(+), 1 deletion(-))

[rileykarson]

Rewording suggestions inline

[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, 29 insertions(+), 1 deletion(-))
Terraform Beta: Diff ( 1 file changed, 29 insertions(+), 1 deletion(-))