Fix some misleading comments about __clone() never being executed
#15926
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For the `Exception`, `ReflectionClass`, and `ReflectionAttribute` classes, the `__clone()` method is declared to be private, and the implementation has a comment that it should never be executed. However, the implementation can be executed by using a `ReflectionMethod`. Fix the comments to instead explain why the implementation is needed. [skip ci]
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For the
Exception,ReflectionClass, andReflectionAttributeclasses, the__clone()method is declared to be private, and the implementation has a comment that it should never be executed. However, the implementation can be executed by using aReflectionMethod. Fix the comments to instead explain why the implementation is needed.[skip ci]