Fix port typo in DNS seedlist example

Author: devkev

source/reference/connection-string.txt

@@ -193,7 +193,7 @@ the DNS SRV records and the options retrieved from the TXT records, the parsed s
 
 .. code-block:: none
 
-   mongodb://mongodb1.example.com:27317,mongodb2.example.com:27107/?replicaSet=mySet&authSource=authDB
+   mongodb://mongodb1.example.com:27317,mongodb2.example.com:27017/?replicaSet=mySet&authSource=authDB
 
 Options set in a TXT record can be overridden by passing in a query string with the URI. In the example below,
 the query string has provided an override for the ``authSource`` option configured in the TXT record of the DNS
@@ -208,7 +208,7 @@ would look like this (after parse).
 
 .. code-block:: none
 
-   mongodb://mongodb1.example.com:27317,mongodb2.example.com:27107/?connectTimeoutMS=300000&replicaSet=mySet&authSource=aDifferentAuthDB
+   mongodb://mongodb1.example.com:27317,mongodb2.example.com:27017/?connectTimeoutMS=300000&replicaSet=mySet&authSource=aDifferentAuthDB
 
 .. note::
    The ``mongodb+srv`` option will fail if there is no available DNS with records that correspond to the