Edited Issue: Polish the help messages of the PS migration commands [471]

Get-Help Enable-Migrations, Update-Database, Get-Migrations, Add-Migration - It looks like we have hard-coded line breakers. See the attached image.
Get-Help Enable-Migrations -example, Update-Database, Get-Migrations, , Add-Migration-> It shows no example.
Get-Help Enable-Migrations -full Update-Database, Get-Migrations, , Add-Migration -> No INPUTS, OUTPUTS, AND RELATED LINKS sections