docs/livepatch: Unify style of livepatch documentation in the ReST format

Make the structure of "Livepatch module Elf format" document similar
to the main "Livepatch" document.

Also make the structure of "(Un)patching Callbacks" document similar
to the "Shadow Variables" document.

It fixes the most visible inconsistencies of the documentation
generated from the ReST format.

Signed-off-by: Petr Mladek <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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