fix weapon weight category descriptions

combat.tex

@@ -119,9 +119,9 @@ Each time the character takes an action they pay a cost in Initiative -- once it
 Moving costs only 2 Initiative, while swinging an axe costs 6.
 You can spend as much as you like, and even go down to an Initiative score of -5, but once the Initiative count reaches 0, the round ends.
 
-Heavy weapons are generally more effective than Light weapons, but they cost 6 Initiative points to take a swing, while Light weapons cost only 4.
+Medium weapons are generally more effective than Light weapons, but they cost 6 Initiative points to take a swing, while Light weapons cost only 4.
 
-Heavy weapons are those with a \gls{weightrating} of -1 or greater.
+Medium weapons are those with a \gls{weightrating} of -1 or greater.
 Smaller weapons, those with a \gls{weightrating} of -2 or less, and brawling attacks with fists, all count as light weapons.
 
 \iftoggle{verbose}{