dotnet/docs 2 merged

• Fix Missing more docs for some migrated .NET APIs Sep 12
• Fix missing system.net.httpwebrequest & system.net.webrequest Sep 8

yishengjin1413/platyPS 1 merged

• merge from Powershell/platyPS Sep 21

PowerShell/platyPS 1 merged

• use tostring instead of FullName when get full type name Sep 8