docs: submitting-patches: clarify difference between Acked-by and Reviewed-by

Newcomers to the kernel need to learn the different tags that are
used in commit messages and when to apply them. Acked-by is sometimes
misunderstood, since the documentation did not really clarify (up to
the previous commit) when it should be used, especially compared to
Reviewed-by.

The previous commit already clarified who the usual providers of Acked-by
tags are, with examples. Thus provide a clarification paragraph for
the comparison with Reviewed-by, and give a couple examples reusing the
cases given above, in the previous commit.

Acked-by: Shuah Khan <[email protected]>
Acked-by: Dan Williams <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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