move watermark in GA section

Author: Himakshi Salhotra

src/pages/resources/openapi.json

@@ -131,14 +131,14 @@
         "Page Manipulation",
         "PDF Properties",
         "Remove Protection",
-        "Split PDF"
+        "Split PDF",
+        "PDF Watermark"
       ]
     },
     {
       "name": "PDF operations Beta",
       "tags": [
-        "PDF Accessibility Checker",
-        "PDF Watermark"
+        "PDF Accessibility Checker"
       ]
     }
   ],