formatting fix

Author: jeff-allen-mongo

source/includes/steps-starting-vsce-individual-fields.yaml

@@ -196,7 +196,7 @@ content: |
                     If you are using 
                     :atlas:`Atlas-managed certificates </security-add-mongodb-users/#select-an-authentication-method>`
                     , your username must be prefaced by "CN="
-                    per `RFC 2253 <https://tools.ietf.org/html/rfc2253>__`. 
+                    per `RFC 2253 <https://tools.ietf.org/html/rfc2253>`__. 
                     For example, the username "X509User" must be 
                     provided as "CN=X509User".