docs(abi): demonstrate abi.encodePacked boundary collision#910
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What type of PR is this (这是什么类型的PR)
Which issue(s) this PR fixes(Optional) (这个PR 修复了什么问题 (可选择))
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Adds a runnable
abi.encodePackedboundary-collision example to the ABI encoding lesson. The example shows that("ab", "c")and("a", "bc")produce the same packed bytes, and contrasts it withabi.encode, which preserves boundaries for dynamic values.This makes the existing warning concrete and gives readers a safe alternative when hashing multiple dynamic parameters.