Revert r42800 "* error.c: [DOC] Update bug tracker url by @ScotterC [F…

…ixes rubyGH-390]"

It should be fixed on www.ruby-lang.org side.
* [Bug ruby#8854]
* ruby/www.ruby-lang.org#288 ruby/www.ruby-lang.org#288

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42803 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

error.c

@@ -48,7 +48,7 @@ extern const char ruby_description[];
 	"You may have encountered a bug in the Ruby interpreter" \
 	" or extension libraries.\n" \
 	"Bug reports are welcome.\n" \
-	"For details: http://bugs.ruby-lang.org/\n\n" \
+	"For details: http://www.ruby-lang.org/bugreport.html\n\n" \
 
 static const char *
 rb_strerrno(int err)