missed a caption

docs/base-logic.tex

@@ -212,7 +212,7 @@ In writing $\vctx, x:\type$, we presuppose that $x$ is not already declared in $
 	}
 \end{mathparpagebreakable}
 
-\subsection{Proof rules}
+\subsection{Proof Rules}
 \label{sec:proof-rules}
 
 The judgment $\vctx \mid \prop \proves \propB$ says that with free variables $\vctx$, proposition $\propB$ holds whenever assumption $\prop$ holds.