correct formatting for reference

Author: drbruced12

infra.rst

@@ -113,8 +113,7 @@ more difficult to address.
    <https://labs.apnic.net/index.php/2021/08/03/a-survey-on-securing-inter-domain-routing-part-1-bgp-design-threats-and-security-requirements/>`__.
    APNIC Blog, August 2021.
 
-   S. Murphy. `BGP Security Vulnerabilities Analysis
-      <https://www.rfc-editor.org/info/rfc4272>`__. RFC 4272, 2006.
+   S. Murphy. `BGP Security Vulnerabilities Analysis <https://www.rfc-editor.org/info/rfc4272>`__. RFC 4272, 2006.
 
    L. Peterson and B. Davie. `Computer Networks: A Systems Approach. Interdomain
    Routing <https://book.systemsapproach.org/scaling/global.html#interdomain-routing-bgp>`__.