[Task] Help refresh duplicates the `WhatIf` description on every run

The markdown refresh appends the common parameter boilerplate instead of replacing it, so each refresh adds one more identical line. Seven help files across four modules currently carry three or more copies of the `WhatIf` description. This is represented by multiple lines of same description

- Fix the refresh so repeated runs are idempotent for common parameter text
- Collapse the existing duplicates in the affected files

Acceptance: two consecutive refreshes of the same module produce no diff, and no help file contains the line more than once.