2013-06-07: Fix typo.

Fix typo.

diff --git a/infocalypse/doc/infocalypse_howto.html b/infocalypse/doc/infocalypse_howto.html
--- a/infocalypse/doc/infocalypse_howto.html
+++ b/infocalypse/doc/infocalypse_howto.html
@@ -89,7 +89,7 @@ You can find more information on Mercuri
 <p>I use version 1.5 (x86 Gentoo) on a daily basis. Later
 versions should work.</p>
 <p>I've smoke tested 1.1.2 (on Ubuntu Jaunty Jackalope) and 1.3 (on
-Widows XP) without finding any problems.</p>
+Windows XP) without finding any problems.</p>
 </li>
 <li>FMS<br />
 Installation of the Freenet Messaging System (FMS) is