Update documentation for any function in iter_any.md

[Mctursh]

Clarify the description of the any function parameters.

Summary

Improved the clarity of the comment explaining Self::Item in the Iterator::any trait example to help readers better understand how the parameter type is determined.

Changes

• Replaced the potentially confusing phrase "Self::Item states it takes arguments to the closure by value" with a clearer explanation
• Added concrete examples showing that Self::Item is determined by the iterator type (e.g., &T for .iter(), T for .into_iter())

Motivation

The original comment could be misinterpreted to mean that Self::Item is always an owned value, when in fact it can be a reference type depending on the iterator. This clarification helps readers understand that:

• The iterator implementation defines what Self::Item is
• Different iterator methods (.iter(), .into_iter(), .iter_mut()) yield different types
• The closure parameter type matches whatever Self::Item is for that specific iterator

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