last link fix for auth

Author: lindseymoore

source/security/authentication.txt

@@ -483,7 +483,7 @@ that returns new credentials as shown in the following example:
    :emphasize-lines: 4-6, 9
 
 If you must provide AWS IAM credentials in a connection string, you can add 
-it to your ``MongoClientSettings`` by calling the `applyConnectionString() <{+api+}/apidocs/mongodb-driver-core/com/mongodb/MongoClientSettings.Builder.html#applyConnectionString(com.mongodb.ConnectionString)>`__
+it to your ``MongoClientSettings`` by calling the `applyConnectionString() <{+core-api+}/com/mongodb/MongoClientSettings.Builder.html#applyConnectionString(com.mongodb.ConnectionString)>`__
 method:
 
 .. literalinclude:: /includes/security/authentication.kt