Improve XML documentation for JsonConvert

Updated XML documentation for oSource parameter to improve clarity.

Author: networkfusion

nanoFramework.Json/JsonConvert.cs

@@ -33,7 +33,8 @@ private struct LexToken
         /// <summary>
         /// Convert an object to a JSON string.
         /// </summary>
-        /// <param name="oSource">The value to convert. Supported types are: Boolean, String, Byte, (U)Int16, (U)Int32,
+        /// <param name="oSource">
+        /// The value to convert. Supported types are: Boolean, String, Byte, (U)Int16, (U)Int32,
         /// Float, Double, Decimal, Array, IDictionary, IEnumerable, Guid, Datetime, DictionaryEntry, Object and null.
         /// </param>
         /// <returns>The JSON object as a string or null when the value type is not supported.</returns>