Merge pull request #874 from riscv/ar_unimplemented

AR: Remove comment about privspec/CSR behavior

Sdtrig.tex

@@ -358,12 +358,4 @@ \section{Trigger Registers}
 Attempts to access an unimplemented Trigger Register raise an illegal instruction
 exception.
 
-\begin{commentary}
-    Privileged spec v1.12 requires accesses to unimplemented CSRs to raise
-    illegal instruction exceptions, but that may change in the future. Even if
-    it does change, the behavior here overrides it for Sdtrig CSRs for backwards
-    compatibility. This is even true if Sdtrig is not implemented at all, so the
-    discovery algorithm in Section~\ref{sec:trigger} still works.
-\end{commentary}
-
 \input{hwbp_registers.tex}