gnucash-docs maint: Fix unclear statement re docbook stylesheets in README.

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/815a298d (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/c768b012 (commit)



commit 815a298dd7f46f38c09c6edba05fe2fc3839d2a5
Author: goodvibes2 <chris.good at ozemail.com.au>
Date:   Wed Jun 22 15:46:35 2016 +1000

    Fix unclear statement re docbook stylesheets in README.



Summary of changes:
 README | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)