rust: pin-init: improve safety documentation for `impl<T> [Pin]Init<T> for T`

The inner SAFETY comments were missing since commit 5cfe7bef6751 ("rust:
enable `clippy::undocumented_unsafe_blocks` lint").

Also rework the implementation of `__pinned_init` to better justify the
SAFETY comment.

Link: https://github.com/Rust-for-Linux/pin-init/pull/62/commits/df925b2e27d499b7144df7e62b01acb00d4b94b8


Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/all/20250529081027.297648-1-lossin@kernel.org


Signed-off-by: Benno Lossin <lossin@kernel.org>