gnucash maint: Fix doxigen comment after changed const behaviour

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/dca13d62 (commit)
	from  https://github.com/Gnucash/gnucash/commit/6c2c2d73 (commit)



commit dca13d6248a611c39e9b6f507f88212a9fc386b0
Author: Geert Janssens <janssens-geert at telenet.be>
Date:   Sat Mar 19 15:07:33 2016 +0100

    Fix doxigen comment after changed const behaviour



Summary of changes:
 src/libqof/qof/qofbook.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)