Add documentation comments to interface stats wrapper

OpenVPN Adapter/OpenVPNInterfaceStats.h

@@ -8,13 +8,39 @@
 
 #import <Foundation/Foundation.h>
 
+/**
+ Class used to provide stats for an interface
+ */
 @interface OpenVPNInterfaceStats : NSObject
 
+/**
+ Amount of received bytes
+ */
 @property (readonly, nonatomic) NSInteger bytesIn;
+
+/**
+ Amout of sent bytes
+ */
 @property (readonly, nonatomic) NSInteger bytesOut;
+
+/**
+ Amount of received packets
+ */
 @property (readonly, nonatomic) NSInteger packetsIn;
+
+/**
+ Amout of sent packets
+ */
 @property (readonly, nonatomic) NSInteger packetsOut;
+
+/**
+ Amount of incoming packets handling errors
+ */
 @property (readonly, nonatomic) NSInteger errorsIn;
+
+/**
+ Amount of outgoing packets handling errors
+ */
 @property (readonly, nonatomic) NSInteger errorsOut;
 
 - (nonnull instancetype) __unavailable init;