DOCSP-27227 Clarify MongoDB Aggregation in Compass Filter Doc (#609)

Author: kanchana-mongodb

source/query/filter.txt

@@ -427,9 +427,7 @@ How Does the Compass Query Compare to MongoDB and SQL Queries?
    MongoDB Aggregation
       .. code-block:: javascript
 
-         db.article.aggregate(
-           { $filter : { author : { $eq : "Joe Bloggs" } } }
-         );
+         db.article.aggregate( { $match: { "author": "Joe Bloggs" } } )
 
    SQL
       .. code-block:: sql