Fix typo.

Thanks to Matt Kraai <kraai@ftbfs.org> for the patch!

wiki/src/doc/about/warning.mdwn

@@ -113,7 +113,7 @@ Compromise](http://blogs.comodo.com/it-security/data-security/the-recent-ra-comp
 Later in 2011, DigiNotar, a Dutch SSL certificate company, incorrectly issued
 certificates to a malicious party or parties. Later on, it came to light that
 they were apparently compromised months before or perhaps even in May of 2009 if
-not earlier. Rogues certificates were issued for domains such as google.com,
+not earlier. Rogue certificates were issued for domains such as google.com,
 mozilla.org, torproject.org, login.yahoo.com and many more. See, [The Tor
 Project: The DigiNotar Debacle, and what you should do about
 it](https://blog.torproject.org/blog/diginotar-debacle-and-what-you-should-do-about-it).