Remove outdated comment
This change removes an outdated comment, left over from the development
process.
* -----------------------------------------------------------------------------
*/
-// Due to schema differences, this may have to be under a submodule specific to sqlite or postgres
-// (or other array-supporting dbs). This may only be the case with the merkle_radix_leaf table.
table! {
merkle_radix_tree (id) {
id -> Int8,
