update doc metadata to reflect doc change date

Author: andrewconnell

docs/index.yml

@@ -11,7 +11,7 @@ metadata:
   ms.audience: Developer # Optional; Remove if no collection is used.
   author: VesaJuvonen #Required; your GitHub user alias, with correct capitalization.
   ms.author: vesaj #Required; microsoft alias of author; optional team alias.
-  ms.date: 26/05/2021 #Required; mm/dd/yyyy format.
+  ms.date: 01/18/2022 #Required; mm/dd/yyyy format.
 
 # linkListType: architecture | concept | deploy | download | get-started | how-to-guide | learn | overview | quickstart | reference | sample | tutorial | video | whats-new