adding clarification on composition fraction type

gdplib/methanol/methanol.py

@@ -210,20 +210,20 @@ def __init__(self):
         )
 
         flow_1 = dict()
-        # Feed 1 (cheap feedstock; component fractions)
+        # Feed 1 (cheap feedstock; component molar fractions)
         flow_1['H2'] = 0.6
         flow_1['CO'] = 0.25
         flow_1['CH4'] = 0.15
         m.flow_1_composition = pe.Param(
-            m.components, initialize=flow_1, default=0, doc='Composition of feed 1'
+            m.components, initialize=flow_1, default=0, doc='Molar composition of feed 1'
         )
         flow_2 = dict()
-        # Feed 2 (expensive feedstock; component fractions)
+        # Feed 2 (expensive feedstock; component molar fractions)
         flow_2['H2'] = 0.65
         flow_2['CO'] = 0.30
         flow_2['CH4'] = 0.05
         m.flow_2_composition = pe.Param(
-            m.components, initialize=flow_2, default=0, doc='Composition of feed 2'
+            m.components, initialize=flow_2, default=0, doc='Molar composition of feed 2'
         )
 
         # Setting operating conditions (bounds) for specific streams in the process