mseal: update mseal.rst

Pedro Falcato's optimization [1] for checking sealed VMAs, which replaces
the can_modify_mm() function with an in-loop check, necessitates an update
to the mseal.rst documentation to reflect this change.

Furthermore, the document has received offline comments regarding the code
sample and suggestions for sentence clarification to enhance reader
comprehension.

[1] https://lore.kernel.org/linux-mm/[email protected]/

Update doc after in-loop change: mprotect/madvise can have
partially updated and munmap is atomic.

Fix indentation and clarify some sections to improve readability.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: df2a7df9a9aa ("mm/munmap: replace can_modify_mm with can_modify_vma")
Fixes: 4a2dd02b0916 ("mm/mprotect: replace can_modify_mm with can_modify_vma")
Fixes: 38075679b5f1 ("mm/mremap: replace can_modify_mm with can_modify_vma")
Fixes: 23c57d1fa2b9 ("mseal: replace can_modify_mm_madv with a vma variant")
Signed-off-by: Jeff Xu <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Cc: Elliott Hughes <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Jorge Lucangeli Obes <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: "Liam R. Howlett" <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Muhammad Usama Anjum <[email protected]>
Cc: Pedro Falcato <[email protected]>
Cc: Stephen Röttger <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: "Theo de Raadt" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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