Moved contextual link back in to TOC

Author: wadepickett

Diff for: docs/navigate/tools-diagnostics/toc.yml

@@ -402,6 +402,8 @@ items:
                 href: ../../core/diagnostics/built-in-metrics-runtime.md
               - name: .NET extensions metrics
                 href: ../../core/diagnostics/built-in-metrics-diagnostics.md
+              - name: ASP.NET Core metrics
+                href: /aspnet/core/log-mon/metrics/built-in?toc=/dotnet/navigate/tools-diagnostics/toc.json&bc=/dotnet/breadcrumb/toc.json
               - name: System.Net metrics
                 href: ../../core/diagnostics/built-in-metrics-system-net.md
           - name: EventCounters