XML comments: consistent formatting of C# keywords

Src/Newtonsoft.Json/JsonSerializationException.cs

@@ -60,7 +60,7 @@ namespace Newtonsoft.Json
         /// with a specified error message and a reference to the inner exception that is the cause of this exception.
         /// </summary>
         /// <param name="message">The error message that explains the reason for the exception.</param>
-        /// <param name="innerException">The exception that is the cause of the current exception, or a null reference (Nothing in Visual Basic) if no inner exception is specified.</param>
+        /// <param name="innerException">The exception that is the cause of the current exception, or <c>null</c> if no inner exception is specified.</param>
         public JsonSerializationException(string message, Exception innerException)
             : base(message, innerException)
         {
@@ -72,8 +72,8 @@ namespace Newtonsoft.Json
         /// </summary>
         /// <param name="info">The <see cref="T:System.Runtime.Serialization.SerializationInfo"/> that holds the serialized object data about the exception being thrown.</param>
         /// <param name="context">The <see cref="T:System.Runtime.Serialization.StreamingContext"/> that contains contextual information about the source or destination.</param>
-        /// <exception cref="T:System.ArgumentNullException">The <paramref name="info"/> parameter is null.</exception>
-        /// <exception cref="T:System.Runtime.Serialization.SerializationException">The class name is null or <see cref="P:System.Exception.HResult"/> is zero (0).</exception>
+        /// <exception cref="T:System.ArgumentNullException">The <paramref name="info"/> parameter is <c>null</c>.</exception>
+        /// <exception cref="T:System.Runtime.Serialization.SerializationException">The class name is <c>null</c> or <see cref="P:System.Exception.HResult"/> is zero (0).</exception>
         public JsonSerializationException(SerializationInfo info, StreamingContext context)
             : base(info, context)
         {