x86: Explicitly note that new instructions are 64-bit and later only.

CTSRD-CHERI · May 22, 2023 · 9170c5f · 9170c5f
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commit 9170c5f
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diff --git a/chap-cheri-x86-64.tex b/chap-cheri-x86-64.tex
@@ -782,6 +782,9 @@ \subsection{New CHERI Instructions}
      is a number between 0 and 65,535 inclusive.
 \end{itemize}
 
+Note that all of these instructions would only be valid in 64-bit mode
+and capability mode.
+
 \subsubsection{Capability-Inspection Instructions}
 
 These instructions would set the \texttt{ZF} flag in \RFLAGS{}