[Telephony] Reinforce API documents

src/Tizen.Telephony/Tizen.Telephony/CallHandle.cs

@@ -21,6 +21,9 @@ namespace Tizen.Telephony
 {
  /// <summary>
  /// This class provides the APIs to get the information about calls.
+ /// It contains several properties such as HandleId, Number, Type, Status, Direction, and ConferenceStatus,
+ /// which allow users to obtain specific details about a call. These properties can be accessed individually
+ /// to gain insights into aspects like the call handle ID, number, type, status, direction, and whether it is a conference call or not.
  /// </summary>
  /// <since_tizen> 3 </since_tizen>
  public class CallHandle

src/Tizen.Telephony/Tizen.Telephony/ChangeNotificationEventArgs.cs

@@ -19,6 +19,9 @@ namespace Tizen.Telephony
 {
  /// <summary>
  /// This class contains the data related to the Notification event.
+ /// Each Notification type corresponds to a specific change in the telephony or network configuration,
+ /// allowing developers to react accordingly. By leveraging these notifications, applications can maintain
+ /// real-time awareness of critical telephony and network conditions, enhancing overall user experience.
  /// </summary>
  /// <since_tizen> 3 </since_tizen>
  public class ChangeNotificationEventArgs : EventArgs

src/Tizen.Telephony/Tizen.Telephony/Modem.cs

@@ -20,6 +20,9 @@ namespace Tizen.Telephony
 {
  /// <summary>
  /// This class provides APIs to obtain information from the modem.
+ /// It includes properties such as Imei, which allows users to retrieve the International
+ /// Mobile Station Equipment Identity (IMEI) of a mobile phone. By utilizing these features,
+ /// developers can gather valuable information about the modem and incorporate it into their applications effectively.
  /// </summary>
  /// <since_tizen> 3 </since_tizen>
  public class Modem

src/Tizen.Telephony/Tizen.Telephony/Network.cs

@@ -20,6 +20,8 @@ namespace Tizen.Telephony
 {
  /// <summary>
  /// The Network class provides APIs to obtain information about the current telephony service network.
+ /// It offers properties such as Lac, which allows users to retrieve the Location Area Code (LAC) of
+ /// the current location. Another property, CellId, enables users to obtain the cell identification number.
  /// </summary>
  /// <since_tizen> 3 </since_tizen>
  public class Network

src/Tizen.Telephony/Tizen.Telephony/Sim.cs

@@ -21,6 +21,9 @@ namespace Tizen.Telephony
 {
  /// <summary>
  /// This class provides APIs that allow you to extract the information stored on a SIM card.
+ /// It includes properties such as IccId, which allows users to retrieve the Integrated
+ // Circuit Card Identification (ICCID) of the SIM card. By leveraging these features,
+ /// developers can gather valuable information about the SIM card and incorporate it into their applications effectively.
  /// </summary>
  /// <since_tizen> 3 </since_tizen>
  public class Sim