documentation should discourage embedding values into query strings

[hmoffatt]

The opening suggestion at https://firebird-driver.readthedocs.io/en/stable/usage-guide.html#id3 on using data values in queries is to embed them into your SQL. There's no warning about this being at risk of SQL injection attacks.

[hmoffatt]

This section appears to be inherited from the fdb docs which have the same flaw.