fix: show correct convar in weapon_portalgun CustomPortalColors desc (#322)

Author: iamsirenstorm

fgd/point/weapon/weapon_portalgun.fgd

@@ -34,7 +34,7 @@
 	model(studio) : "World Model" : "models/weapons/w_portalgun.mdl" : "The model shown for the portalgun entity and in the player's hand in third-person view."
 	viewmodel(studio) : "View Model" : "models/weapons/v_portalgun.mdl" : "The model shown in the player's first-person view."
 
-	CustomPortalColors(boolean) : "Custom Portal Colors" : 0 : "Use custom portal colors. This boolean is ignored if ConVar cl_alternate_portal_colors is set to 1."
+	CustomPortalColors(boolean) : "Custom Portal Colors" : 0 : "Use custom portal colors. This boolean is ignored if ConVar cl_portal_alternate_colors is set to 1."
 	Portal1Color(color255) : "Primary Portal Color" : "64 160 255" : "Color to use for the primary (Left/Blue) portal."
 	Portal2Color(color255) : "Secondary Portal Color" : "255 160 32" : "Color to use for the primary (Right/Orange) portal."