DOCS-505 spelling fix and move example closer to associated sentence

Author: kay-kim

source/reference/method/db.collection.update.txt

@@ -11,27 +11,28 @@ db.collection.update()
       accepts parameters in a more clear :term:`document` form to
       specify ``multi`` and ``upsert`` options.
 
-   The :method:`update() <db.collection.update()>` method provides the ability to
-   modify an existing document in a collection.
+   The :method:`update() <db.collection.update()>` method provides the
+   ability to modify an existing document in a collection.
 
    By default the :method:`update() <db.collection.update()>` method updates a
    single document. If you specify a ``multi`` update, the
    :method:`update() <db.collection.update()>` method will update all
    documents in the collection that match the query criteria. If you
    specify ``upsert``, the :method:`update() <db.collection.update()>`
    method will insert the document if no document matches the query
-   criteria, and preform a conventional update otherwise. The
-   operation has the following form: 
+   criteria; otherwise, it will perform a conventional update. 
+
+   Before version 2.2, in the :program:`mongo` shell, ``upsert`` and
+   ``multi`` were positional boolean options and the operation has the
+   following form:
 
    .. code-block:: javascript
 
       db.collection.update(query, update, <upsert,> <multi>)
 
-   Before version 2.0, in the :program:`mongo` shell, ``upsert`` and
-   ``multi`` were positional boolean options. Since version 2.2, the
-   :method:`update() <db.collection.update()>` method can *also* take an
-   ``options`` :term:`document` as a parameter to specify the
-   ``multi`` and the ``upsert`` options.
+   Since version 2.2, the :method:`update() <db.collection.update()>`
+   method can *also* take an ``options`` :term:`document` as a
+   parameter to specify the ``multi`` and the ``upsert`` options.
 
    The :method:`update() <db.collection.update()>` method takes the following
    parameters: