Rollup merge of #139749 - ruancomelli:docs/library/core/src/pin/fix-typo-necessarily-to-necessary, r=joboet

docs(library/core/src/pin): fix typo "necessarily" -> "necessary"

Fix a typo in [`library/core/src/pin.rs`](https://github.com/ruancomelli/rust/blob/14662fabeb69fe5ab6c6e68051bf9f80d4aaaa35/library/core/src/pin.rs), from

> As we'll see later, this is **necessarily** from the time the value is first pinned until the end of its lifespan.

to

> As we'll see later, this is **necessary** from the time the value is first pinned until the end of its lifespan.

(my emphasis).

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