Updating comments.

[ci skip]

data/game_config.cfg

@@ -32,6 +32,8 @@
 
     hp_bar_scaling=0.6
     xp_bar_scaling=0.5
+
+	# zoom factors must be a sorted list of ascending multipliers
     zoom_levels = 0.25, 0.33333333333333333, 0.5, 0.75, 1.0, 1.25, 1.5, 2.0, 3.0, 4.0
 
     #temporary disable hex brightening

src/display.cpp

@@ -91,7 +91,6 @@ unsigned int display::last_zoom_ = SmallZoom;
 
 // Returns index of zoom_levels which is closest match to input zoom_level
 // Assumption: zoom_levels is a sorted vector of ascending tile sizes
-// (game_config is set-up this way as of October 2019 but there is no documentation stating it has to be so)
 int get_zoom_levels_index(unsigned int zoom_level)
 {
 	zoom_level = utils::clamp(zoom_level, MinZoom, MaxZoom);	// ensure zoom_level is within zoom_levels bounds