fix broken links

src/pages/rules/adventuring.md

@@ -368,7 +368,7 @@ When a PC increases their level, the following actions may be performed:
 -   Roll a hit die (based on the class), and add it to their maximum hit points.
     -   1s and 2s may be re-rolled a single time.
 -   Check the [Skilled Ability Check Modifier table](#skilled-ability-checks) to determine if their skill modifier increases.
--   Check the PC's [class](/classes/index.html) and [race](/races/index.html) to see if they gain any new.
+-   Check the PC's [class](/classes/) and [race](/races/) to see if they gain any new.
 -   The player may pick one of the PC's abilities, and roll 3d6.
     -   If the resulting roll is higher than the ability score, increase the score by 1.