Updating tools build.json for 3.6.1 release (#16503)

Author: reddyashish

tools/autobuild/build.json

@@ -4,6 +4,6 @@
   "master_id": "Win64",
   "build_id": "3.6.1",
   "name": "3.6.1",
-  "build_milestone": "FCS",
-  "description":"Update 1"
+  "build_milestone": "Update 1",
+  "description":"Build"
 }