Para tags are mangled when explicitly declared in remarks in combination with new-lines

[ericstj]

See https://github.com/dotnet/runtime/blob/925205d06d82ce5e0d24e4e313fd66887fe89795/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/CollectionsMarshal.cs#L50-L60

This produced escaped para tags that required fixup dotnet/dotnet-api-docs@88e3234#diff-f01295b45b7c030a49d50f0e76b8ffb9e41e3c2238ae1bc6097cc1b781570ad5L61

We should investigate what's going wrong and fix the tool

[ericstj]

Just saw this again and confirmed it happens with explicitly authored <para> tags https://github.com/dotnet/runtime/blob/ce6fab18bb5c7392b1d084839af6ea0308f66217/src/libraries/System.Reflection.Metadata/src/System/Reflection/Metadata/TypeNameParseOptions.cs#L10-L19