seg.sgml中一处注释错误修正

Author: ChenHuajun

postgresql/doc/src/sgml/seg.sgml

@@ -18,7 +18,10 @@
  </para>
 
  <sect2>
-  <title><--!Rationale-->原理</title>
+<--!
+  <title>Rationale</title>
+-->
+  <title>原理</title>
 
   <para>
    <!--The geometry of measurements is usually more complex than that of a
@@ -478,4 +481,4 @@ postgres=> select '10(+-)1'::seg as seg;
 
  </sect2>
 
-</sect1>
+</sect1>