Missing item in dotnet-api-docs removes the existing item in triple slash

[carlossanlop]

Example:

PortToTripleSlash.exe \
  -Docs $ENV:SOURCEREPOS\dotnet-api-docs\xml 
  -CsProj $ENV:SOURCEREPOS\runtime\src\libraries\Microsoft.Extensions.Hosting.WindowsServices\src\Microsoft.Extensions.Hosting.WindowsServices.csproj 
  -IncludedAssemblies Microsoft.Extensions.Hosting.WindowsServices 
  -IncludedNamespaces Microsoft.Extensions.Hosting.WindowsServices

One inheritdoc is removed:

As well as a param: