Modify some comments based on code review

Author: sgbihu

libraries/CurieBLE/examples/IMUBleCentral/IMUBleCentral.ino

@@ -19,8 +19,9 @@
 #include <CurieBLE.h>
 
 /*
-   This sketch example partially implements the standard Bluetooth Low-Energy Battery service.
-   For more information: https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx
+   This sketch example works with IMUBleNotification.ino
+    IMUBleNotification.ino will send Notification to this sketch.
+    This sketch will receive the Notifications and out put the received data.
 */
 
 #define MAX_IMU_RECORD 1

libraries/CurieBLE/examples/IMUBleNotification/IMUBleNotification.ino

@@ -20,8 +20,9 @@
 #include <CurieIMU.h>
 
 /*
-   This sketch example partially implements the standard Bluetooth Low-Energy Battery service.
-   For more information: https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx
+   This sketch example works with IMUBleCentral.ino
+    This sketch will read IMU data from sensor and send Notification to IMUBleCentral.ino
+    IMUBleCentral.ino will receive the Notifications and output the received data.
 */
 
 #define MAX_IMU_RECORD 1

libraries/CurieBLE/examples/LEDCentral/LEDCentral.ino

@@ -17,9 +17,13 @@
   1301 USA
 */
 
-// This example can work with CallbackLED to show the profile read/write operation in central
 #include <CurieBLE.h>
 
+/* 
+   This example can work with CallbackLED 
+    to show the profile read/write operation in central
+*/
+
 struct bt_le_conn_param conn_param = {0x18, 0x28, 0, 400};
 
 const int ledPin = 13; // set ledPin to use on-board LED

libraries/CurieBLE/examples/Scanning/Scanning.ino

@@ -17,6 +17,12 @@
 */
 #include <CurieBLE.h>
 
+/*
+    This sketch try to show the scan function
+     The sketch will list the device's MAC address and device name to the console
+     The list will refresh every 3s
+*/
+
 #define BLE_SCANING_DEVICE_MAX_CNT  5
 
 typedef struct{