gnucash-docs maint: Remove a spurious space from our DTD

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/5d610dbc (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/bf41d179 (commit)



commit 5d610dbc058dd5291fd69dd069781d29a192ca71
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Wed Feb 3 02:55:05 2021 +0100

    Remove a spurious space from our DTD
    
    While xmllint ignored it, it caused hundreds of errors in eclipses
    validator.



Summary of changes:
 docbook/gnc-docbookx.dtd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)