[SPCA] Fixes a few errors

semester3/spca/parts/01_c/01_basics/06_integers.tex

@@ -1,4 +1,5 @@
 \subsubsection{Integers in C}
+\label{sec:c-integers}
 As a reminder, integers are encoded as follows in big endian notation, with $x_i$ being the $i$-th bit and $w$ being the number of bits used to represent the number:
 \begin{itemize}[noitemsep]
     \item \bi{Unsigned}: $\displaystyle \sum_{i = 0}^{w - 1} x_i \cdot 2^i$