minor fixes in doc links

docs/changelog.rst

@@ -458,9 +458,6 @@ Changes in 0.8.3
 - Document.select_related() now respects ``db_alias`` (#377)
 - Reload uses shard_key if applicable (#384)
 - Dynamic fields are ordered based on creation and stored in _fields_ordered (#396)
-
-  **Potential breaking change:** http://docs.mongoengine.org/en/latest/upgrade.html#to-0-8-3
-
 - Fixed pickling dynamic documents ``_dynamic_fields`` (#387)
 - Fixed ListField setslice and delslice dirty tracking (#390)
 - Added Django 1.5 PY3 support (#392)

docs/guide/querying.rst

@@ -609,7 +609,7 @@ to push values with index::
 .. note::
     Currently only top level lists are handled, future versions of mongodb /
     pymongo plan to support nested positional operators.  See `The $ positional
-    operator <http://www.mongodb.org/display/DOCS/Updating#Updating-The%24positionaloperator>`_.
+    operator <https://docs.mongodb.com/manual/tutorial/update-documents/#Updating-The%24positionaloperator>`_.
 
 Server-side javascript execution
 ================================

mongoengine/fields.py

@@ -2045,7 +2045,7 @@ class ImageField(FileField):
 
 class SequenceField(BaseField):
     """Provides a sequential counter see:
-     http://www.mongodb.org/display/DOCS/Object+IDs#ObjectIDs-SequenceNumbers
+     https://docs.mongodb.com/manual/reference/method/ObjectId/#ObjectIDs-SequenceNumbers
 
     .. note::