update link to nativeinterop

Author: baronfel

docs/index.md

@@ -20,7 +20,7 @@ The following namespaces are available:
 
 * [FSharp.Reflection](reference/fsharp-reflection.html) - Library functionality for accessing additional information about F# types and F# values at runtime, augmenting that available through [System.Reflection](https://docs.microsoft.com/dotnet/api/system.reflection). See also [F# Reflection](https://en.wikibooks.org/wiki/F_Sharp_Programming/Reflection) in the F# Wiki Book.  
 
-* [FSharp.NativeInterop](reference/fsharp-linq.html) - Basic functionality for native interopability. See also [F# External Functions](https://docs.microsoft.com/en-us/dotnet/fsharp/language-reference/functions/external-functions) in the F# Language Guide. 
+* [FSharp.NativeInterop](reference/fsharp-nativeinterop.html) - Basic functionality for native interopability. See also [F# External Functions](https://docs.microsoft.com/en-us/dotnet/fsharp/language-reference/functions/external-functions) in the F# Language Guide. 
 
 * [FSharp.Core.CompilerServices](reference/fsharp-core-compilerservices.html) - Library functionality for supporting type providers and code generated by the F# compiler. See also [F# Type Providers](https://docs.microsoft.com/en-us/dotnet/fsharp/tutorials/type-providers/) in the F# Language Guide.