improve translation of mid of ch15-02#149

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tatsuya6502 merged 2 commits intorust-lang-ja:master-jafrom m-shaka:improve-ch15-02-mid

Apr 18, 2021

Commits on Apr 17, 2021

feat: improve translation of two sections of ch15-02 from "Defining Our Own Smart Pointer"
m-shaka
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Commits on Apr 18, 2021

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