Add documentation about the new release notification feature

[daxian-dbw]

Issue Details

The update notification feature:
Code PR: PowerShell/PowerShell#10689
RFC PR: PowerShell/PowerShell-RFC#162

Version(s) of document impacted

• Impacts 7 document
• Impacts 6 document
• Impacts 5.1 document
• Impacts 5.0 document
• Impacts 4.0 document
• Impacts 3.0 document

Reason(s) for not selecting all version of documents

• The documented feature was introduced in selected version of PowerShell
• This issue only shows up in selected version of the document

[joeyaiello]

Going to start on this one right now, may hand off to @daxian-dbw later today

[daxian-dbw]

@joeyaiello I can take over this one.