docs: fix old wrong description

See bcit-ci/CodeIgniter@c08f27b#diff-7514ae0935f0dd8fb697247fd01aec6786acbbe22bebdd8e13d2a4fddf5e1337

Author: kenjis

user_guide_src/source/database/transactions.rst

@@ -50,7 +50,7 @@ Strict Mode
 
 By default, CodeIgniter runs all transactions in Strict Mode. When strict
 mode is enabled, if you are running multiple groups of transactions, if
-one group fails all groups will be rolled back. If strict mode is
+one group fails all subsequent groups will be rolled back. If strict mode is
 disabled, each group is treated independently, meaning a failure of one
 group will not affect any others.