gnucash-docs maint: Add ENTITY vers-last-2 for reference of major changes

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/095b8bce (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/1cebf7b9 (commit)



commit 095b8bce8140a28529fbd8d79ec6443ea57e806e
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Tue Jun 22 00:44:21 2021 +0200

    Add ENTITY vers-last-2 for reference of major changes



Summary of changes:
 docbook/gnc-docbookx.dtd | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)