Extract code snippets from how-to-insert-a-chart-into-a-spreadsheet.md

Extract the code snippets from [docs/spreadsheet/how-to-insert-a-chart-into-a-spreadsheet.md](https://github.com/OfficeDev/open-xml-docs/blob/main/docs/spreadsheet/how-to-insert-a-chart-into-a-spreadsheet.md) and use docfx snippets to retrieve them from the samples folder and audit the text.