Remove windows docs from list of try jobs. (#64125)

Bug:
  https://github.com/flutter/flutter/issues/64121

dev/try_builders.json

@@ -72,12 +72,6 @@
          "task_name": "win_customer_testing",
          "enabled":true
       },
-      {
-         "name": "Windows docs",
-         "repo": "flutter",
-         "task_name": "win_docs",
-         "enabled":true
-      },
       {
          "name": "Windows framework_tests",
          "repo": "flutter",
@@ -91,4 +85,4 @@
          "enabled":true
       }
    ]
-}
\ No newline at end of file
+}