docs `microsoft` pages sort order fix (#14771)

`integrations/document_loaders/` `Excel` and `OneNote` pages in the
navbar were in the wrong sort order. It is because the file names are
not equal to the page titles.
- renamed `excel` and `onenote` file names

docs/vercel.json

@@ -92,6 +92,14 @@
       "source": "/docs/integrations/chat/hunyuan",
       "destination": "/docs/integrations/chat/tencent_hunyuan"
     },
+    {
+      "source": "/docs/integrations/document_loaders/excel",
+      "destination": "/docs/integrations/document_loaders/microsoft_excel"
+    },
+    {
+      "source": "/docs/integrations/document_loaders/onenote",
+      "destination": "/docs/integrations/document_loaders/microsoft_onenote"
+    },
     {
       "source": "/docs/integrations/providers/aws_dynamodb",
       "destination": "/docs/integrations/platforms/aws#aws-dynamodb"