Fix links

Author: janvorli

docs/standard/assembly/unloadability-howto.md

@@ -41,7 +41,7 @@ This section assumes the simpler version of the `TestAssemblyLoadContext` is bei
 
 You can create an instance of the custom `AssemblyLoadContext` and load an assembly into it as follows:
 
-!code-csharp[](~/samples/snippets/standard/assembly/unloading/simple_example.cs#3)]
+!code-csharp[](~/samples/snippets/standard/assembly/unloading/simple_example.cs#2#3)]
 
 For each of the assemblies referenced by the loaded assembly, the `TestAssemblyLoadContext.Load` method is called so that the `TestAssemblyLoadContext` can decide where to get the assembly from. In our case, it returns `null` to indicate that it should be loaded into the default context from locations that the runtime uses to load assemblies by default.
 
@@ -238,10 +238,10 @@ This example is used in the debugging above.
 
 ### Main testing program
 
-[!code-csharp[Main testing program](~/samples/snippets/core/tutorials/unloading/unloadability_issues_example_main.cs)]
+[!code-csharp[Main testing program](~/samples/snippets/standard/assembly/unloading/unloadability_issues_example_main.cs)]
 
 ## Program loaded into the TestAssemblyLoadContext
 
 This is the `test.dll` passed to the `ExecuteAndUnload` method in the main testing program.
 
-[!code-csharp[Program loaded into the TestAssemblyLoadContext](~/samples/snippets/core/tutorials/unloading/unloadability_issues_example_test.cs)]
+[!code-csharp[Program loaded into the TestAssemblyLoadContext](~/samples/snippets/standard/assembly/unloading/unloadability_issues_example_test.cs)]