Adding comments to some of the CCX extensions & mirroring protocol object

Sources/StORM/CCXExtensions.swift

@@ -117,7 +117,7 @@ extension Array where Iterator.Element == Mirror {
                 }
             })
         }
-        // Lets make sure if the primaryKey is set, it is the first object returned for asData/asDataDic functions:
+        // Lets make sure if the primaryKey is set, it is the first object returned for asData/asDataDic & firstAsKey functions:
         if let keyLabel = primaryKey, allChild.first?.label != keyLabel {
             if let index = allChild.index(where: { (child) -> Bool in
                 return child.label == keyLabel

Sources/StORM/CCXMirroring.swift

@@ -25,6 +25,10 @@ open class CCXMirror: CCXMirroring {
     public func didInitializeSuperclass() {
         self.superclassCount += 1
     }
+    
+    /// This is intended to make it easier to specify your primary key, rather than having the id specifically in this model.
+    ///
+    /// - Returns: This returns the label for the primary key for this model.
     open func primaryKeyLabel() -> String? {
         return nil
     }