Fixed Speed + Projectiles to Dexterity + Projectiles for ranged combat

rules/projectiles.tex

 \begin{itemize}
   \item
-  Players roll Speed + Projectiles against \gls{tn} 6 to hit stationary targets.
+  Players roll Dexterity + Projectiles against \gls{tn} 6 to hit stationary targets.
   \item
   Every 5 steps adds +1 to the \gls{tn}.
   \item