Update AppServicePlans.json (#23776)

Updating the Description for the App Service Plans - Reboot Worker API. With VMSS stamps being utilized for App Services, the worker names need not necessarily have to start with RD. They can start with RD, dw, pd, xn, lw, pl, hr, aw, al etc. Due to multiple variations, making changes to the description.

Author: prampMSFT

specification/web/resource-manager/Microsoft.Web/stable/2022-03-01/AppServicePlans.json

@@ -1432,7 +1432,7 @@
           {
             "name": "workerName",
             "in": "path",
-            "description": "Name of worker machine, which typically starts with RD.",
+            "description": "Name of worker machine.",
             "required": true,
             "type": "string"
           },