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Rollup merge of #143341 - Manishearth:from-raw-parts-ptr-cast, r=samueltardieu

Mention that casting to *const () is a way to roundtrip with from_raw_parts See discussion on #81513

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Original file line number	Diff line number	Diff line change
`@@ -106,6 +106,9 @@ pub const fn metadata<T: PointeeSized>(ptr: *const T) -> <T as Pointee>::Metadat`
`106`	`106`	/// For slices, see the documentation of [`slice::from_raw_parts`] for safety requirements.
`107`	`107`	`/// For trait objects, the metadata must come from a pointer to the same underlying erased type.`
`108`	`108`	`///`
	`109`	`+/// If you are attempting to deconstruct a DST in a generic context to be reconstructed later,`
	`110`	+/// a thin pointer can always be obtained by casting `const T` to `const ()`.
	`111`	`+///`
`109`	`112`	/// [`slice::from_raw_parts`]: crate::slice::from_raw_parts
`110`	`113`	`#[unstable(feature = "ptr_metadata", issue = "81513")]`
`111`	`114`	`#[inline]`

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