Documentation/submitting-patches: Extend commit message layout description

Add more blurb about the level of detail that should be contained in a
patch's commit message. Extend and make more explicit what text should
be added under the --- line. Extend examples and split into more easily
palatable paragraphs.

This has been partially carved out from a tip subsystem handbook
patchset by Thomas Gleixner:

  https://lkml.kernel.org/r/[email protected]

and incorporates follow-on comments.

Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Robert Richter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[jc: Tweaked "example subjects" wording]
Signed-off-by: Jonathan Corbet <[email protected]>

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