Update ToC

Author: scottaddie

docs/azure/TOC.yml

@@ -90,7 +90,7 @@
     - name: Unit testing and mocking
       href: ./sdk/unit-testing-mocking.md
     - name: Configure a proxy
-      href: ./sdk/azure-sdk-configure-proxy.md
+      href: ./sdk/configure-proxy.md
     - name: Library method types
       href: ./sdk/protocol-convenience-methods.md
     - name: Packages list