fix core-api usage

Author: rachel-mack

source/aggregation.txt

@@ -112,7 +112,7 @@ manual.
 
    .. replacement:: searchoperator-interface-api-docs
 
-    the `SearchOperator Interface API documentation <{+core-api+}/com/mongodb/client/model/search/SearchOperator.html>`__
+    the `SearchOperator Interface API documentation <{+core-api+}/client/model/search/SearchOperator.html>`__
 
 Aggregation Example
 -------------------