Change the NSFormatter API to match the Darwin version (#396)

Author: Pushkar N Kulkarni

Foundation/NSByteCountFormatter.swift

@@ -54,7 +54,7 @@ public class ByteCountFormatter : Formatter {
     */
     public class func string(fromByteCount byteCount: Int64, countStyle: ByteCountFormatter.CountStyle) -> String { NSUnimplemented() }
 
-    /* Convenience method on stringForObjectValue:. Convert a byte count into a string without creating an NSNumber.
+    /* Convenience method on string(for:):. Convert a byte count into a string without creating an NSNumber.
     */
     public func stringFromByteCount(_ byteCount: Int64) -> String { NSUnimplemented() }
 

Foundation/NSPersonNameComponentsFormatter.swift

@@ -58,7 +58,7 @@ public class PersonNameComponentsFormatter : Formatter {
      */
     public class func localizedString(from components: PersonNameComponents, style nameFormatStyle: Style, options nameOptions: Options = []) -> String { NSUnimplemented() }
 
-    /* Convenience method on stringForObjectValue:. Returns a string containing the formatted value of the provided components object.
+    /* Convenience method on string(for:):. Returns a string containing the formatted value of the provided components object.
      */
     public func string(from components: PersonNameComponents) -> String { NSUnimplemented() }