Bug 1602735 - Update SeaMonkey website for 2.53.1 Beta 1 release - corrections. r=me

src/releases/2.53.1b1.en.html

@@ -79,12 +79,13 @@
   Windows version please uninstall it before installing the x64 version. Your
   profile data will be preserved doing this.<br>
   The x86 version can run on any current Windows version starting with Windows
-  XP SP3.
+  7.
   </li>
   <li><font size="+1" color="#ff0000"><b>Automatic upgrades from prior versions
   are disabled for this release. If you need to upgrade from an earlier
   version, please download the full installer from the downloads section and
-  install SeaMonkey 2.49.5 manually over the previous version.</b></font><br>
+  install SeaMonkey 2.53.1 Beta 1 manually over the previous
+  version.</b></font><br>
   </li>
 </ul>
 </div>

src/releases/seamonkey2.53.1/index.en.html

@@ -112,7 +112,7 @@ specific changes and security fixes in this release.
 <p>
 Additional important security fixes up to Current Firefox 72 and a few
 enhancements have been backported. We will continue to enhance SeaMonkey
-security in subsequent 2.53 beta and release versions as as fast as we are
+security in subsequent 2.53 beta and release versions as fast as we are
 able to.
 </p>
 <h3>SeaMonkey-specific changes</h3>