Update pg.md

EawuChen · Dec 18, 2015 · f084361 · f084361
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 ![PostgreSQL](https://wiki.postgresql.org/images/3/30/PostgreSQL_logo.3colors.120x120.png)
 
 About:[PostgreSQL About](http://www.postgresql.org/about/)
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 [《PostgreSQL 源码分析系列》](#pg_kernel)
 
 * <a name="pg_kernel"/> PostgreSQL 源码分析系列
 
 介绍:PostgreSQL 源码分析系列
 
+> 分割线
 
 * [《PostgreSQL Documentation》](http://www.postgresql.org/docs/manuals/)