Fix Repeater Bits Definition

There appears to have been a copy-paste error, resulting in the down link definition labeling a bit as U_p instead of D_p

standard.tex

@@ -653,7 +653,7 @@ Uplink and downlink tones are encoded in 3 bytes. CTCSS and DCS are both support
   \hline
   23 & 22 & 21 & 20 & 19 & 18 & 17 & 16 & 15 & 14 & 13 & 12 & 11 & 10 & 9 & 8 & 7 & 6 & 5 & 4 & 3 & 2 & 1 & 0 \\
   \hline
-  $U_e$ & $U_p$ & \multicolumn{10}{|c|}{$U_v$} & $D_e$ & $U_p$ & \multicolumn{10}{|c|}{$D_v$} \\
+  $U_e$ & $U_p$ & \multicolumn{10}{|c|}{$U_v$} & $D_e$ & $D_p$ & \multicolumn{10}{|c|}{$D_v$} \\
   \hline
 \end{tabular} \\
 \newline \noindent