Trivial docstring cleanup in TestServerAdvancedOps

The resize test was moved in commit
1df75ee5025c2f1efad86dd86c350865d1893b29.

Related-Prod: PRODX-2516
Change-Id: I8ab2bf3927a23574f5934d7339be983fbb590126
diff --git a/tempest/scenario/test_server_advanced_ops.py b/tempest/scenario/test_server_advanced_ops.py
index 89b9fdd..8aa729b 100644
--- a/tempest/scenario/test_server_advanced_ops.py
+++ b/tempest/scenario/test_server_advanced_ops.py
@@ -32,7 +32,6 @@
     """The test suite for server advanced operations
 
     This test case stresses some advanced server instance operations:
-     * Resizing a volume-backed instance
      * Sequence suspend resume
     """