Fix in exception templates (xml docs)

data/templates/file/CSharp/CSharp.Exception.xft

@@ -28,7 +28,7 @@ using System.Runtime.Serialization;
 namespace ${StandardNamespace}
 {
 	/// <summary>
-	/// Desctiption of ${ClassName}.
+	/// Description of ${ClassName}.
 	/// </summary>
 	public class ${ClassName} : Exception, ISerializable
 	{

data/templates/file/VB/VB.Exception.xft

@@ -27,7 +27,7 @@ Imports System.Runtime.Serialization
 
 Namespace ${StandardNamespace}
 	''' <summary>
-	''' Desctiption of ${ClassName}.
+	''' Description of ${ClassName}.
 	''' </summary>
 	Public Class ${ClassName}
 		Inherits Exception

src/Libraries/ICSharpCode.Decompiler/DecompilerException.cs

@@ -23,7 +23,7 @@ using Mono.Cecil;
 namespace ICSharpCode.Decompiler
 {
 	/// <summary>
-	/// Desctiption of DecompilerException.
+	/// Description of DecompilerException.
 	/// </summary>
 	public class DecompilerException : Exception, ISerializable
 	{