Add support for matrix type in doc format

src/docs_format.cpp

@@ -82,6 +82,7 @@ enum OdinDocTypeKind : u32 {
 	OdinDocType_RelativePointer  = 20,
 	OdinDocType_RelativeSlice    = 21,
 	OdinDocType_MultiPointer     = 22,
+	OdinDocType_Matrix           = 23,
 };
 
 enum OdinDocTypeFlag_Basic : u32 {