gnucash-docs maint: Replace starting balance with opening balance. Add comma to the numbers over 1000.

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/913549d7 (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/d989dc0d (commit)



commit 913549d7ad5a0f1897ca6b6c79c16e7aeee59511
Author: TANIGUCHI Yasuaki <yasuakit at gmail.com>
Date:   Wed Jul 14 20:29:10 2021 +0900

    Replace starting balance with opening balance.
    Add comma to the numbers over 1000.



Summary of changes:
 guide/C/ch_txns.xml | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)