Updated minor comments in config file

Author: milenaveneziani

mpas_analysis/default.cfg

@@ -4795,10 +4795,12 @@ seasons =  ['AMJ','OND']
 # comparison grid(s) on which to plot analysis
 comparisonGrids = ['arctic']
 
-# Polar Class of vessel according to IMO. Range is 1 to 12 (increments of 1).
+# Polar Class of vessel according to IMO. Range is 1 to 12 (increments of 1),
+# corresponding to the following vessel types: 'PC1', 'PC2', 'PC3', 'PC4',
+# 'PC5', 'PC6', 'PC7', 'IA Super', 'IA', 'IB', 'IC', 'Not Ice Strengthened'
 polarClass = 6
 
-# reference lat/lon for sea ice plots in the northern hemisphere
+# minimum lat and reference lon for sea ice plots in the northern hemisphere
 minimumLatitude = 50
 referenceLongitude = 0
 
@@ -4826,10 +4828,12 @@ seasons =  ['AMJ','OND']
 # comparison grid(s) on which to plot analysis
 comparisonGrids = ['antarctic']
 
-# Polar Class of vessel according to IMO. Range is 1 to 12 (increments of 1).
+# Polar Class of vessel according to IMO. Range is 1 to 12 (increments of 1),
+# corresponding to the following vessel types: 'PC1', 'PC2', 'PC3', 'PC4',
+# 'PC5', 'PC6', 'PC7', 'IA Super', 'IA', 'IB', 'IC', 'Not Ice Strengthened'
 polarClass = 6
 
-# reference lat/lon for sea ice plots in the northern hemisphere
+# minimum lat and reference lon for sea ice plots in the southern hemisphere
 minimumLatitude = -50
 referenceLongitude = 180