docs(l1): update snap sync documentation

[fmoletta]

Motivation
Updates snap sync documentation to reflect changes up to #1936, please merge it first

Description

• Update snap sync documentation with latest changes

Closes #issue_number

[github-actions]

| File                                                                                     | Lines | Diff |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ethrex_l2/src/commands/test.rs                       | 207   | -2   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/blockchain/blockchain.rs                          | 182   | -26  |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/blockchain/error.rs                               | 95    | -2   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/blockchain/payload.rs                             | 662   | -6   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/common/types/block.rs                             | 649   | -51  |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/common/types/mod.rs                               | 18    | -1   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/l2/prover/zkvm/interface/risc0/src/main.rs        | 44    | -4   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/l2/prover/zkvm/interface/sp1/src/main.rs          | 45    | -4   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/gas_cost.rs                           | 1064  | -58  |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/bitwise_comparison.rs | 279   | -9   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/block.rs              | 196   | -9   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/environment.rs        | 369   | -6   |
+------------------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/system.rs             | 703   | -10  |
+------------------------------------------------------------------------------------------+-------+------+

Total lines added: 0
Total lines removed: 188
Total lines changed: 188