Add 'inheritdoc' to XmlDoc completion.

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngine.cs

@@ -2949,6 +2949,11 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 				"Includes comments from a external file",
 				"include file=\"|\" path=\"\">"
 			);
+			yield return factory.CreateLiteralCompletionData(
+				"inheritdoc",
+				"Inherit documentation from a base class or interface",
+				"inheritdoc/"
+			);
 			yield return factory.CreateLiteralCompletionData(
 				"list",
 				"Create a list or table",

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Completion/ICompletionDataFactory.cs

@@ -1,4 +1,4 @@
-// 
+// 
 // ICompletionDataFactory.cs
 //  
 // Author:
@@ -40,7 +40,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 		/// <summary>
 		/// Creates a generic completion data.
 		/// </summary>
-		/// <returns>
+		/// <param name='title'>
 		/// The title of the completion data
 		/// </param>
 		/// <param name='description'>