doc: fix Windows code snippet tags
Those were wrongly marked as bash (that's my bad, it's coming from https://github.com/nodejs/node/pull/48082), when the text around it was referencing PowerShell or Command Prompt.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Those were wrongly marked as bash (that's my bad, it's coming from https://github.com/nodejs/node/pull/48082), when the text around it was referencing PowerShell or Command Prompt.