docs: rust: extend abstraction and binding documentation

Add some basics explained by Miguel in [1] to the documentation.
And connect it with some hints where this is implemented in the
kernel.

Link: https://www.linuxfoundation.org/webinars/rust-for-linux-writing-abstractions-and-drivers [1]
Cc: Miguel Ojeda <[email protected]>
Signed-off-by: Dirk Behme <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded first section for better clarity and some minor nits.
  Changed link into Link tag, use tabs for code block
  indentation and wrap at 80. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

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