Merge pull request #1857 from bagerard/fix_doc_of_delete_write_concern

Fix .delete doc of **write_concern

mongoengine/document.py

@@ -585,9 +585,8 @@ class Document(BaseDocument):
         :param signal_kwargs: (optional) kwargs dictionary to be passed to
             the signal calls.
         :param write_concern: Extra keyword arguments are passed down which
-            will be used as options for the resultant
-            ``getLastError`` command.  For example,
-            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
+            will be used as options for the resultant ``getLastError`` command.
+            For example, ``save(..., w: 2, fsync: True)`` will
             wait until at least two servers have recorded the write and
             will force an fsync on the primary server.