tests: update comments

Author: gsmolk

tests/restore.py

@@ -2748,7 +2748,7 @@ def test_partial_restore_include(self):
 
     def test_partial_restore_backward_compatibility_1(self):
         """
-        old binary should be version < 2.2.0
+        old binary should be of version < 2.2.0
         """
         fname = self.id().split('.')[3]
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')
@@ -2851,6 +2851,7 @@ def test_partial_restore_backward_compatibility_1(self):
 
     def test_partial_restore_backward_compatibility_merge(self):
         """
+        old binary should be of version < 2.2.0
         """
         fname = self.id().split('.')[3]
         backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')

tests/retention.py

@@ -1629,7 +1629,7 @@ def test_failed_merge_redundancy_retention(self):
         self.del_test_dir(module_name, fname)
 
     # @unittest.expectedFailure
-    # @unittest.skip("skip")
+    @unittest.skip("skip")
     def test_wal_depth(self):
         """
         ARCHIVE replica: