Fix warnings

src/statistical-and-mathematical-methods-for-ai/sections/_linear_algebra.tex

@@ -232,7 +232,7 @@ Common norms are:
         
         The vector $\vec{w} \in U^\perp$ s.t. $\Vert \vec{w} \Vert = 1$ is the \textbf{normal vector} of $U$. \marginnote{Normal vector}
         %
-        \begin{figure}[h]
+        \begin{figure}[ht]
             \centering
             \includegraphics[width=0.4\textwidth]{img/_orthogonal_complement.pdf}
             \caption{Orthogonal complement of a subspace $U \subseteq \mathbb{R}^3$}