0.16.2 release ja: fix commit link

Author: azuchi

_posts/ja/releases/2018-07-29-release-0.16.2.md

@@ -90,7 +90,7 @@ Bitcoin Coreは他のほとんどのUnixライクなシステムで動作する
 
 ### GUI
 - #12432 `f78e7f6` [qt] send: Clear All also resets coin control options (Sjors)
-- #12617 `21dd512` gui: Show messages as text not html (laanwj)
+- #12617 `21dd5127` gui: Show messages as text not html (laanwj)
 - #12793 `cf6feb7` qt: Avoid reseting on resetguisettigs=0 (MarcoFalke)
 
 ### ビルドシステム