Remove dead content (#1059)

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Author: Rick-Anderson

iis/TOC.yml

@@ -1211,8 +1211,6 @@
           href: web-development-reference/native-code-development-overview\walkthrough-creating-a-global-level-http-module-by-using-native-code.md
     - name: Native Code API Reference
       href: web-development-reference/native-code-api-reference\native-code-api-reference.md
-    - name: Server Variables
-      href: web-dev-reference/server-variables.md
 - name: FTP Extensibility Reference
   items: 
     - name: Native API Reference