Update pg.md

Ternence · Dec 18, 2015 · f53d7e7 · f53d7e7
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@@ -10,7 +10,7 @@ About:[PostgreSQL About](http://www.postgresql.org/about/)
 
 介绍:PostgreSQL 源码分析系列
 
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 * [《PostgreSQL Documentation》](http://www.postgresql.org/docs/manuals/)