tools/memory-model: Clarify LKMM's limitations in litmus-tests.txt

As discussed, clarify LKMM not recognizing certain kinds of orderings.
In particular, highlight the fact that LKMM might deliberately make
weaker guarantees than compilers and architectures.

[ paulmck: Fix whitespace issue noted by checkpatch.pl. ]

Link: https://lore.kernel.org/all/YpoW1deb%[email protected]/T/#u
Co-developed-by: Alan Stern <[email protected]>
Signed-off-by: Alan Stern <[email protected]>
Signed-off-by: Paul Heidekrüger <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Reviewed-by: Joel Fernandes (Google) <[email protected]>
Cc: Charalampos Mainas <[email protected]>
Cc: Pramod Bhatotia <[email protected]>
Cc: Soham Chakraborty <[email protected]>
Cc: Martin Fink <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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