Upgrade document using template version 3 syntax

Registered by Qitao

Now part of the document is version 2 syntax, and part of it is version 3.
So the document needs to be updated to Syntax 3 to replace Syntax 2

Blueprint information

Status:
Complete
Approver:
Eyal B
Priority:
Undefined
Drafter:
Hongtao Qi
Direction:
Needs approval
Assignee:
Hongtao Qi
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Eyal B
Completed by
Eyal B

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.opendev.org/#/q/topic:dev

Addressed by: https://review.opendev.org/723770
    Update doc: Using version 3 to update not_operator_support.rst

Gerrit topic: https://review.opendev.org/#/q/topic:bp/blueprint

Gerrit topic: https://review.opendev.org/#/q/topic:bp/doc-upgrade

Addressed by: https://review.opendev.org/726723
    Update doc: Using version 3 to update templates-loading.rst

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