rust: pin-init: change examples to the user-space version

Replace the examples in the documentation by the ones from the
user-space version and introduce the standalone examples from the
user-space

rust: pin-init: change examples to the user-space version

Replace the examples in the documentation by the ones from the
user-space version and introduce the standalone examples from the
user-space version such as the `CMutex<T>` type.

The `CMutex<T>` example from the pinned-init repository [1] is used in
several documentation examples in the user-space version instead of the
kernel `Mutex<T>` type (as it's not available). In order to split off
the pin-init crate, all examples need to be free of kernel-specific
types.

Link: https://github.com/rust-for-Linux/pinned-init [1]
Signed-off-by: Benno Lossin <[email protected]>
Reviewed-by: Fiona Behrens <[email protected]>
Tested-by: Andreas Hindborg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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