Remove part of documentation telling that one can create knex instance without providing client attribute

[elhigu]

This is not true, passing empty doesn't work

You can even use knex without a connection, just for its query building features. Just pass in an empty object when initializing the library. Specify a client if you are interested in a particular flavour of SQL.

[mercmobily]

Hello! Thanks for flagging this. The wording you quoted was in the old docs, but it has already been removed. The current guide does not suggest passing an empty object; instead it shows using a client only, which is the correct pattern when you want SQL generation without a live connection.

Passing an empty object does not work because the client attribute is required to choose the SQL dialect. The current guide shows the right approach in docs/src/guide/index.md:316, for example:

const knex = require('knex')({ client: 'pg' });

This lets you build queries (for example via .toString() / .toSQL()) without configuring a connection. No documentation change is strictly needed now. If helpful, we could add a small note near that example to make it explicit that a client is required even for pure query building.