Typo

Author: johnnyshields

docs/reference/configuration.txt

@@ -170,7 +170,7 @@ can be configured.
 
           # Specify the auth source, i.e. the database or other source which
           # contains the user's login credentials. Allowed values for auth source
-          # depend on the authentication mechanism, as explained the server documentation:
+          # depend on the authentication mechanism, as explained in the server documentation:
           # https://docs.mongodb.com/manual/reference/connection-string/#mongodb-urioption-urioption.authSource
           # If no auth source is specified, the default auth source as
           # determined by the driver will be used. Please refer to: