Verify phase-out of Los Angeles County General Relief

The program document only says:
>If your monthly income is between $201 and $620, the amount of your grant will be lower than $221/month

We need more detail.
[ABP 392 General Relief Information Sheet Form_rev 07-2021.pdf](https://github.com/PolicyEngine/policyengine-us/files/13366885/ABP.392.General.Relief.Information.Sheet.Form_rev.07-2021.pdf)

In absence of that, we'll phase it out linearly.

Start by reviewing the linked ABP 392 General Relief Information Sheet and locating the Los Angeles County General Relief implementation in the repository. Confirm whether the document provides the missing grant schedule; done means the phase-out follows verified details, or the documented fallback is applied linearly when no more detail is available.

Written by the indexing model from the issue text.