Document potential todos in the documentation

Signed-off-by: Severin Kaderli <severin@kaderli.dev>

documentation/thesis/content/02_preliminaries.tex

@@ -8,8 +8,6 @@ The main thread and Web Workers can communicate together using messages. They ca
 
 Web Workers are used in this project to put a load on the CPU to modify the magnetic field without locking up the website itself.
 
-\section{Hamming Distance}
-
 \section{CRC}
 \label{section:crc}
 \gls{crc}
@@ -17,3 +15,5 @@ Web Workers are used in this project to put a load on the CPU to modify the magn
 \section{Manchester Code}
 
 \section{Hall Sensor}
+
+// TODO: Write these sections