updated file name

Author: mrm9084

articles/azure-app-configuration/TOC.yml

@@ -205,7 +205,7 @@
     - name: JavaScript
       href: howto-timewindow-filter-javascript.md
     - name: Python
-      href: howto-timewindow-filter-python.md
+      href: howto-time-window-filter-python.md
   - name: Roll out features to targeted audience
     items:
     - name: Overview