Fixed broken links in interop docs (dotnet#4573)

* Fixed broken links in interop docs

* Updated additional links

* Removed 'en-us' from URLs

Author: Ron Petrusha

xml/System.Runtime.InteropServices/PrimaryInteropAssemblyAttribute.xml

@@ -45,7 +45,7 @@
   
  To specify a primary interop assembly in managed source code, you must apply the <xref:System.Runtime.InteropServices.GuidAttribute?displayProperty=nameWithType> and <xref:System.Runtime.InteropServices.PrimaryInteropAssemblyAttribute> to the assembly at design time. The <xref:System.Runtime.InteropServices.GuidAttribute> on the primary interop assembly identifies the LIBID of the type library and the <xref:System.Runtime.InteropServices.PrimaryInteropAssemblyAttribute> identifies the version of the particular type library for which this assembly is the primary interop assembly. The <xref:System.Runtime.InteropServices.PrimaryInteropAssemblyAttribute> can appear multiple times if the assembly is the primary interop assembly for multiple versions of the same type library.  
   
- When using the types defined in a type library, always reference the primary interop assembly for that type library, rather than reimporting or redefining the types themselves. For guidelines and procedures on how to produce or use primary interop assemblies, see [Primary Interop Assemblies](http://msdn.microsoft.com/library/b977a8be-59a0-40a0-a806-b11ffba5c080). For a detailed description of the type library importing process, see [Type Library to Assembly Conversion Summary](https://msdn.microsoft.com/library/bf3f90c5-4770-4ab8-895c-3ba1055cc958(v=vs.100)).  
+ When using the types defined in a type library, always reference the primary interop assembly for that type library, rather than reimporting or redefining the types themselves. For guidelines and procedures on how to produce or use primary interop assemblies, see [Primary Interop Assemblies](https://msdn.microsoft.com/en-us/library/b977a8be-59a0-40a0-a806-b11ffba5c080(v=vs.100)). For a detailed description of the type library importing process, see [Type Library to Assembly Conversion Summary](https://msdn.microsoft.com/library/bf3f90c5-4770-4ab8-895c-3ba1055cc958(v=vs.100)).  
   
  ]]></format>
     </remarks>