rust: allow `unreachable_pub` for doctests

Examples (i.e. doctests) may want to show public items such as structs,
thus the `unreachable_pub` warning is not very helpful.

Thus allow it for all doctests.

In addition, remove it from the existing `expect`s we have in a couple
doctests.

Suggested-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/rust-for-linux/aRG9VjsaCjsvAwUn@google.com/
Reviewed-by: David Gow <davidgow@google.com>
Acked-by: Benno Lossin <lossin@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20251110113528.1658238-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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