RCS1226: Add paragraph to documentation comment

Example

/// <summary>
/// summary1 // RCS1226
/// 
/// summary2 // RCS1226
/// summary3
/// </summary>
class Foo
{
}

/// <summary>
/// <para>summary1</para>
/// <para>
/// summary2
/// summary3
/// </para>
/// </summary>
class Foo
{
}