Fix missing </literal> in sources.list.5.xml page

Git-Dch: ignore

doc/sources.list.5.xml

@@ -275,7 +275,7 @@ deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [.
 		always to consider this source as trusted, even if it doesn't pass
 		authentication checks. It disables parts of &apt-secure;, and should
 		therefore only be used in a local and trusted context (if at all) as
-		otherwise security is breached. The value <literal>no<literal> does
+		otherwise security is breached. The value <literal>no</literal> does
 		the opposite, causing the source to be handled as untrusted even if
 		the authentication checks passed successfully. The default value can't
 		be set explicitly.