reset index and toc for hosting

Author: gewarren

docs/core/unmanaged-api/index.md

@@ -14,9 +14,6 @@ These articles describe APIs that were introduced in .NET Core 2.0 and later ver
 [Debugging](./debugging/index.md)\
 Describes the debugging API, which enables a debugger to debug code that runs in the common language runtime (CLR) environment.
 
-[Hosting](./hosting/index.md)\
-Describes the hosting API, which enables unmanaged hosts to integrate the CLR into their applications.
-
 [Metadata](./metadata/index.md)\
 Describes the metadata API, which enables a client such as a compiler to generate or access a component's metadata without the types being loaded by the CLR.