update initialize redirect location

Author: mattwojo

.openpublishing.redirection.json

@@ -22,8 +22,8 @@
     },
     {
       "source_path": "wsl/initialize-distro.md",
-      "redirect_url": "wsl/install-win10",
+      "redirect_url": "install-win10",
       "redirect_document_id": true
     }
   ]
-}
+}