Logger.deprecate signature

[Documentation](https://knexjs.org/guide/#log) says that the `Logger.deprecate` method signature is

```
deprecate(message) {},
```

while according to [source code](https://github.com/knex/knex/blob/3.1.0/lib/logger.js#L57C3-L57C12) and [types](https://github.com/knex/knex/blob/3.1.0/types/index.d.ts#L3125) it should be

```
deprecate?: (method: string, alternative: string) => void;
```

Compare the Logger.deprecate signature in the linked documentation with lib/logger.js and types/index.d.ts. Update the documentation to match the source and type definition, then verify the Logger documentation page shows the corrected signature.

Written by the indexing model from the issue text.