Fix typo in lang_alter_table.in
I think it should be being instead of begin.
--- pages/lang_altertable.in.orig Thu Aug 27 20:08:11 2020 +++ pages/lang_altertable.in Thu Aug 27 19:14:04 2020 @@ -49,7 +49,7 @@ <p> Prior to version 3.26.0 ([dateof:3.26.0]), FOREIGN KEY references to a table that is renamed were only edited if the [PRAGMA foreign_keys=ON], or in other words if -[foreign key constraints] were begin enforced. With +[foreign key constraints] were being enforced. With [PRAGMA foreign_keys=OFF], FOREIGN KEY constraints would not be changed when the table that the foreign key referred to (the "[parent table]") was renamed. Beginning with version 3.26.0, FOREIGN KEY constraints