#14 NullableGuid doc errors

[(luKa) aka Luca Minudel]

Missing <summary> documentation for
F:NullableTypes.NullableGuid.Null

[(luKa) aka Luca Minudel]

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more:
- Missing <value> documentation for
P:NullableTypes.NullableGuid.Value
- Missing <returns> documentation for
M:NullableTypes.NullableGuid.CompareTo(System.Object)
- Missing <returns> documentation for
M:NullableTypes.NullableGuid.Equals
(NNullableGuid,NullableGuid)
- Missing <returns> documentation for
M:NullableTypes.NullableGuid.System#Xml#Serialization#IXml
Serializable#GetSchema
- NullableGuid.IXmlSerializable.ReadXml:
Missing <param> documentation for reader
- NullableGuid.IXmlSerializable.WriteXml:
- Missing <param> documentation for writer
- Missing <returns> documentation for
M:NullableTypes.NullableGuid.op_Equality
(NullableTypes.NullableGuid,NullableTypes.NullableGuid)
- Missing <returns> documentation for
M:NullableTypes.NullableGuid.op_Inequality
(NullableTypes.NullableGuid,NullableTypes.NullableGuid)

[Damien Guard]

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Fix for all these except the IXmlSerializable ones. Those
are incomplete as per the other types.

[Damien Guard]

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Fixed the .Null one and CompareTo. Checked into HEAD.