Minor: indentation

Author: puentesarrin

source/reference/connection-string.txt

@@ -31,14 +31,14 @@ The components of this string are:
 
 #. ``mongodb://``
 
-    A required prefix to identify that this is a string in the standard
-    connection format.
+   A required prefix to identify that this is a string in the standard
+   connection format.
 
 #. ``username:password@``
 
-  Optional. If specified, the client will attempt to log in to the
-  specific database using these credentials after connecting to the
-  :program:`mongod` instance.
+   Optional. If specified, the client will attempt to log in to the
+   specific database using these credentials after connecting to the
+   :program:`mongod` instance.
 
 #. ``host1``