Update KYC steps in onboarding documentation (#600)

# Description

This PR updates the KYC section of the solver on-boarding guide to
provide a more detailed description of the process.

# Changes

Updated
https://docs.cow.fi/cow-protocol/tutorials/solvers/onboard#requirements-for-joining-the-cow-dao-bonding-pool


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Expanded solver onboarding KYC guidance into a clear checklist:
company incorporation and shareholder details, passports for main
shareholders/developers, and include the solver name in the submission
email.
* Retained instruction to withhold documents until after the meeting and
added expected KYC processing time of 1–3 working days (subject to
variability).
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Haris Angelidakis <64154020+harisang@users.noreply.github.com>

Author: bram-vdberg

docs/cow-protocol/tutorials/solvers/onboard.md

@@ -25,7 +25,13 @@ sidebar_position: 1
 ## 1. Essential information for joining the solver competition
 
 ### Requirements for joining the CoW DAO bonding pool
-The general KYC requirements are to send us documentation proving that you are the beneficial owners of the company behind the solver and 1-2 passports of some of the main developers of the solver. Do not send this before the meeting, we will explain the process during the meeting so that you can send the documents afterwards.
+The general KYC requirements are as follows:
+
+- Incorporation details of the company behind the solver that includes details of who the shareholders are.
+- One or two passports of the main shareholders and developers of the solver.
+- Please include the name of your solver in the email.
+
+Do not send this before the meeting, we will explain the process during the meeting so that you can send the documents afterwards. We usually expect the KYC process to take about 1 to 3 working days, but it may vary.
 
 Given the risk that will be carried by the CoW DAO bonding pool we also ask that solvers who join the solver competition through the CoW DAO bonding pool start solving on Arbitrum first. After being in production on Arbitrum solvers can move to other L2's relatively easily. But joining the mainnet competition will require further evaluation after some time of solving on L2's.