fix indent [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48616 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -24,7 +24,7 @@ Thu Nov 27 19:04:50 2014  Koichi Sasada  <ko1@atdot.net>
 
 	  For example, the following program
 	    def foo(k1: 1); end # line 1
-            foo(k2: 2)          # line 2
+	    foo(k2: 2)          # line 2
 	  causes "unknown keyword: k2 (ArgumentError)".
 
 	  Before this patch, the backtrace location is only line 2.