starknet_transaction_prover: simplify README wording per Orwell style rules

[dan-starkware]

Prose-only edit to crates/starknet_transaction_prover/README.md, applying Orwell's writing rules. No facts, numbers, or names changed.

• Line 121: long words → short ones — sufficient → enough, approximately → about.

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https://claude.ai/code/session_01GjrAzEXJmrgsDjg9YSA1c6

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Generated by Claude Code

[cursor]

PR Summary

Low Risk
README prose only; no code, config, or API behavior changes.

Overview
Documentation-only tweak in starknet_transaction_prover/README.md under Transaction requirements, on the line about using 0x5f5e100 as an l2_gas.max_amount upper bound.

The sentence now says that bound is enough for about 1 million Cairo steps instead of sufficient for approximately the same claim. Numbers, hex values, and behavior are unchanged.

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[reviewable-StarkWare]

This change is