typo fix (I don't fix the same in qgisapp.cpp to not break the translations)

git-svn-id: http://svn.osgeo.org/qgis/branches/Version-1_0@9811 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: borysiasty

doc/index.html

@@ -59,7 +59,7 @@ <h2>Whats new in Version 1.0.0?</h2>
     A new plugin was added for interpolating point features into ASCII grid layers.
   </li>
   <li>
-    The python plugin manager was completely overhauled, the new version having many improvements, including checking that the version of QGIS running will support a plugin that is being installed.
+    The python plugin installer was completely overhauled, the new version having many improvements, including checking that the version of QGIS running will support a plugin that is being installed.
   </li>
   <li>
     Plugin toolbar positions are now correctly saved when the application is closed.