Added comments

Author: Robert Pieta

Foundation/NSOrderedSet.swift

@@ -210,6 +210,7 @@ extension NSOrderedSet {
     }
 
     open func isSubset(of other: NSOrderedSet) -> Bool {
+        // If self is larger then self cannot be a subset of other
         if count > other.count {
             return false
         }
@@ -223,6 +224,7 @@ extension NSOrderedSet {
     }
 
     open func isSubset(of set: Set<AnyHashable>) -> Bool {
+        // If self is larger then self cannot be a subset of set
         if count > set.count {
             return false
         }

Foundation/NSSet.swift

@@ -208,6 +208,7 @@ extension NSSet {
     }
 
     open func isSubset(of otherSet: Set<AnyHashable>) -> Bool {
+        // If self is larger then self cannot be a subset of otherSet
         if count > otherSet.count {
             return false
         }