fix textcolor command typing

chap/textFormating.tex

@@ -81,7 +81,7 @@
 
         \medskip
         You might also want to change your text colour, which is what the {color} package is for. It provides the
-        |textcolor{colour}{text}| command, \textcolor{red}{which allows you} \textcolor{blue}{to change your text colour}.
+        |\textcolor{colour}{text}| command, \textcolor{red}{which allows you} \textcolor{blue}{to change your text colour}.
 
         \section{Special characters} \label{sec: special-charaters}
             \subsection{LaTeX command characters}