New page to document cash reconciliation, and fixed other H1 titles that should have
been in small caps. Forward up to V15.
task id: 3000530
closesodoo/documentation#2956
X-original-commit: 0d2dd59349
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
Signed-off-by: Aarab Tom (toaa) <toaa@odoo.com>
