update changelog and fix minor typo in docstring

Author: bagerard

docs/changelog.rst

@@ -6,6 +6,7 @@ Changelog
 Development
 ===========
 - (Fill this out as you fix issues and develop your features).
+- Bugfix: manually setting SequenceField in DynamicDocument doesn't increment the counter #2471
 
 Changes in 0.22.1
 =================

mongoengine/fields.py

@@ -1162,7 +1162,7 @@ def __init__(
 
         :param document_type: The type of Document that will be referenced
         :param dbref:  Store the reference as :class:`~pymongo.dbref.DBRef`
-          or as the :class:`~pymongo.objectid.ObjectId`.id .
+          or as the :class:`~pymongo.objectid.ObjectId`.
         :param reverse_delete_rule: Determines what to do when the referring
           object is deleted
         :param kwargs: Keyword arguments passed into the parent :class:`~mongoengine.BaseField`