fix gls covering formatting

glossary.tex

@@ -366,7 +366,7 @@
   description={shows how many steps of the dice armour covers.
   A creature with \glsentrytext{dr} 5 means that they can subtract 5 from any Damage.
   However, if the \glsentrytext{tn} to hit them is 10, with a Covering of 3, then their armour protects only 3 steps of the dice (`10, 11, and 12').
-  Rolling 3 steps over their \glsentrytext{tn} ($\glsentrytext{tn} 10 + 3 = 13$) means the attack ignores armour, making it \pgls{vitalShot}},
+  Rolling 3 steps over their \glsentrytext{tn} (\glsentrytext{tn} $10 + 3 = 13$) means the attack ignores armour, making it \pgls{vitalShot}},
 }
 
 \newglossaryentry{restingaction}{