Update appendix-obsolete.sgml

Author: chegong18

postgresql/doc/src/sgml/appendix-obsolete.sgml

@@ -1,15 +1,24 @@
 <!-- doc/src/sgml/obsolete.sgml -->
 
 <appendix id="appendix-obsolete">
+<!--==========================orignal english content==========================
  <title>Obsolete or Renamed Features</title>
+____________________________________________________________________________-->
+ <title>废弃或重命名的特性</title>
 
+<!--==========================orignal english content==========================
  <para>
    Functionality is sometimes removed from PostgreSQL, feature, setting
    and file names sometimes change, or documentation moves to different
    places. This section directs users coming from old versions of the
    documentation or from external links to the appropriate new location
    for the information they need.
  </para>
+____________________________________________________________________________-->
+ <para>
+   函数有时会从PostgreSQL中移除，特性、设置和文件名有时也会变化，或者文档会转移到不同的地方。
+   本节指导来自旧版本文档或外部链接的用户到适当的新位置来获取他们需要的信息。
+ </para>
 
  <!--
   This section exists so that people following /current/ links to documentation