Doc/xmpl fix: zFindFlagPreCheckOnlyXSoff

Release 0.8.2.3-beta

DOCUMENTATION:
-Fixed: The following referred to/used a non-existing flag-pre-check
function. Corrected to zFindFlagPreCheckOnlyXSoff
--demo_video.html
--tasks/snr.html#findxmplftst
Added xbnpe2.jeffyepstein.com

Release 0.8.2.3-beta
-Added: Additional documentation site for "stable_non_master_release"
branch: http://xbnpe2.jeffyepstein.com
DOCUMENTATION:
-Fixed: The following referred to/used a non-existing flag-pre-check
function. Corrected to
zFindFlagPreCheckOnlyXSoff
--demo_video.html
--tasks/snr.html#findxmplftst