Update docs to correctly define `conditional_to_base64` by directionless · Pull Request #8460 · osquery/osquery

While we are at it, can we also update these lines:

osquery/docs/wiki/introduction/sql.md

Lines 505 to 506 in b534877

osquery> select conditional_to_base64(device_id + char(183)) as device_id from cpu_info;
device_id = 0

to

osquery> select conditional_to_base64(device_id || char(183)) as device_id from cpu_info;
device_id = Q1BVMMK3

The string concatenation operator is wrong, so the function gets passed 0, and no encoding happens.