docs: finish up accessors for now; let's just see what we write for the paper

docs/program-logic.tex

@@ -465,7 +465,6 @@ For this reason, we also call such accessors \emph{non-atomic}.
 
 The reasons accessors are useful is that they let us talk about ``opening X'' (\eg ``opening invariants'') without having to care what X is opened around.
 Furthermore, as we construct more sophisticated and more interesting things that can be opened (\eg invariants that can be ``cancelled'', or STSs), accessors become a useful interface that allows us to mix and match different abstractions in arbitrary ways.
-\ralf{This would be much more convincing if we had forward references here to sections describing canellable invariants and STSs.}
 
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