feat: [function] Add a PostDescription parameter for Get-DocsName

[rulasg]

as a user
To name documentas as they are generated on a process flow
it would be very useful to allow appending a tag at the end of the description

This it´s very useful when using the concatenation of previouse file to the actual name

dir previousefile | gdn | gdn -Path -date -postDescription "tag"

This comand will use the same name as the previouse file changing date and adding tag