Fix a spelling error

The word "shoudl" was being replaced with "should".

Author: QuickWrite

docs/sections/introduction.tex

@@ -51,7 +51,7 @@ \subsubsection{Components}
 \subsubsection{How a Turing Machine works}
 
 To understand how a Turing Machine works, it is beneficial to show an example. The example shows a Turing Machine which has a state machine
-with a ``3-state Busy Beaver''. This program shoudl create as many $1$s on the tape as possible whilst also being finite (not executing indefinitely):
+with a ``3-state Busy Beaver''. This program should create as many $1$s on the tape as possible whilst also being finite (not executing indefinitely):
 
 \begin{minipage}{0.45\textwidth}
 Let's say we have a Turing Machine with the symbols $0,1$ and the blank symbol is $0$. We also define that the starting tape consists of blank symbols.