Fix two typos

header.tex

@@ -22,10 +22,10 @@ Before transmission, a header must be affixed to the packet. This is used so tha
 \\\\
 Note that even though the data length field is a two-byte value, $L$ has a maximum value of $8191$. There are several motivating factors for this limitation.
 \begin{enumerate}
-  \item Microcontrollers do not have much RAM. By choosing a maximum size of 8191 bytes, the protocol ensure that many low-cost microcontrollers can fully buffer any and all CATS packets.
+  \item Microcontrollers do not have much RAM. By choosing a maximum size of 8191 bytes, the protocol ensures that many low-cost microcontrollers can fully buffer any and all CATS packets.
   \item Individual CATS traffic shouldn't congest the channel for overly long durations. Over-the-air transfers run at 9600bps, so ignoring the header, the transmission time for a max-size packet is
   \begin{equation}
-  \frac{\mathrm{second}}{9600~\mathrm{bits}} \cdot \frac{8~\mathrm{bits}}{\mathrm{bytes}} \cdot 8191~\mathrm{bytes} \approx 6.8~\mathrm{seconds}
+  \frac{\mathrm{second}}{9600~\mathrm{bits}} \cdot \frac{8~\mathrm{bits}}{\mathrm{byte}} \cdot 8191~\mathrm{bytes} \approx 6.8~\mathrm{seconds}
   \end{equation}
   While a maximum of seven seconds is longer than the roughly two second long maximum APRS packet (256 bytes at 1200bps), it's also shorter than the widely accepted twelve seconds of FT8, while sending an order of magnitude more data than either.
 \end{enumerate}