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website: clarify prestate tracer diffMode (#30081)

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docs/developers/evm-tracing/built-in-tracers.md
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@ -219,11 +219,12 @@ The prestate tracer has two modes: `prestate` and `diff`. The `prestate` mode re
In `diff` mode the result object will contain a `pre` and a `post` object: In `diff` mode the result object will contain a `pre` and a `post` object:
1. Any read-only access is omitted completely from the result. This mode is only concerned with state modifications. 1. The result only includes accounts that were modified. Accounts without changes will be omitted in this mode.
2. In `pre` you will find the state of an account before the tx started, and in post its state after tx execution finished. 2. In `pre` you will find the state of an account before the tx started, and in `post` its state after tx execution finished.
3. `post` will contain only the modified fields. e.g. if `nonce` of an account hasn't changed it will be omitted from `post`. 3. `pre` can include fields that were not modified, if some other fields for the same account were modified.
4. Deletion (i.e. account selfdestruct, or storage clearing) will be signified by inclusion in `pre` and omission in `post`. 4. `post` will contain only the modified fields. e.g. if `nonce` of an account hasn't changed it will be omitted from `post`.
5. Insertion (i.e. account creation or new slots) will be signified by omission in `pre` and inclusion in `post`. 5. Deletion (i.e. account selfdestruct, or storage clearing) will be signified by inclusion in `pre` and omission in `post`.
6. Insertion (i.e. account creation or new slots) will be signified by omission in `pre` and inclusion in `post`.
To run this tracer in `diff` mode, pass `tracerConfig: {diffMode: true}` in the API call. To run this tracer in `diff` mode, pass `tracerConfig: {diffMode: true}` in the API call.