Update docstring about sync utils deprecation

peewee_async.py

@@ -1023,8 +1023,14 @@ def connect_kwargs_async(self):
 def sync_unwanted(database):
     """Context manager for preventing unwanted sync queries.
     `UnwantedSyncQueryError` exception will raise on such query.
+
+    NOTE: sync_unwanted() context manager is **deprecated**, use
+    database `allow_sync` property directly or via `Manager.allow_sync()`
+    context manager.
     """
-    warnings.warn("sync_unwanted() context manager is deprecated",
+    warnings.warn("sync_unwanted() context manager is deprecated, "
+                  "use database `allow_sync` property directly or "
+                  "via Manager `allow_sync()` context manager. ",
                   DeprecationWarning)
     old_allow_sync = database.allow_sync
     database.allow_sync = False
@@ -1034,9 +1040,12 @@ def sync_unwanted(database):
 
 class UnwantedSyncQueryError(Exception):
     """Exception which is raised when performing unwanted sync query.
+
+    NOTE: UnwantedSyncQueryError is deprecated, `assert` is used instead.
     """
     def __init__(self, *args, **kwargs):
-        warnings.warn("UnwantedSyncQueryError is deprecated",
+        warnings.warn("UnwantedSyncQueryError is deprecated, "
+                      "assert is used instead.",
                       DeprecationWarning)