校验 basebackup-to-shell.sgml 完成

- 复原一处不该翻译的

Author: linjialiang

postgresql/doc/src/sgml/basebackup-to-shell.sgml

@@ -13,7 +13,7 @@ ________________________________________________________-->
  </indexterm>
 ________________________________________________________-->
  <indexterm zone="basebackup-to-shell">
-  <primary>将basebackup转换为shell</primary>
+  <primary>basebackup_to_shell</primary>
  </indexterm>
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