Correct the representation type of the block nVersion field to uint32_t.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

protocol/protocol.tex

@@ -2849,7 +2849,7 @@ The \Zcash \blockHeader format is as follows:
 Bytes & \heading{Name} & \heading{Data Type} & \heading{Description} \\
 \hhline{|=|=|=|=|}
 
-4 & $\nVersion$ & \type{int32\_t} & The \blockVersionNumber indicates which set of
+4 & $\nVersion$ & \type{uint32\_t} & The \blockVersionNumber indicates which set of
 \block validation rules to follow. The current and only defined \blockVersionNumber
 for \Zcash is $4$. \\ \hline
 
@@ -3633,6 +3633,8 @@ The errors in the proof of Ledger Indistinguishability mentioned in
           to \type{uint64\_t}. (This is not a consensus change because the type of
           $\vpubOld$ and $\vpubNew$ was already specified to be $\range{0}{\MAXMONEY}$;
           it just better reflects the implementation.)
+    \item Correct the representation type of the \block $\nVersion$ field to
+          \type{uint32\_t}.
 \end{itemize}
 
 \subparagraph{2016.0-beta-1.7}