Fix typo and reword the sentence.

hlinnaka · hlinnaka · commit 86ab71d58d4e · 2011-09-08T18:17:57.000+03:00
diff --git a/doc/src/sgml/ref/create_index.sgml b/doc/src/sgml/ref/create_index.sgml
@@ -342,7 +342,7 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ <replaceable class="parameter">name</
 
    </variablelist>
    <para>
-    GiST indexes additionaly accepts parameters:
+    GiST indexes additionally accept parameter:
    </para>
 
    <variablelist>
