[Communication] - SDK - Rename folders to be more consistent with other services (#14366)

* [Communication] rename folders to be more consistent with cognitive services

* [cSpell] fixing the cSpell for Chat path

Author: JoshuaLai

cSpell.json

@@ -763,7 +763,7 @@
             ]
         },
         {
-            "filename": "**/specification/communication/data-plane/Microsoft.CommunicationServicesChat/preview/2020-09-21-preview2/communicationserviceschat.json",
+            "filename": "**/specification/communication/data-plane/Chat/preview/2020-09-21-preview2/communicationserviceschat.json",
             "words": [
                 "readreceipts"
             ]