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Deletes this ITextRun from its parent IRichText object.
Use this method to remove the current text run from the rich text content of a cell.
void Delete()
Sub Delete()
IRichText richText = worksheet.Range["A1"].RichText;
richText.Add("Hello");
ITextRun textRun = worksheet.Range["A1"].Characters(1, 3);
textRun.Delete();