landlock: Clarify documentation for struct landlock_ruleset_attr

The explanation for @handled_access_fs and @handled_access_net has
significant overlap and is better explained together.

* Explain the commonalities in structure-level documentation.
* Clarify some wording and break up longer sentences.
* Put emphasis on the word "handled" to make it clearer that "handled"
  is a term with special meaning in the context of Landlock.

I'd like to transfer this wording into the man pages as well.

Signed-off-by: Günther Noack <[email protected]>
Cc: Alejandro Colomar <[email protected]>
Cc: Konstantin Meskhidze <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
[mic: Format commit message]
Signed-off-by: Mickaël Salaün <[email protected]>

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