[docs][suggestion] `delete_rows!` zero-based and exclusive indexing surprising

[hraftery]

I'm new to GoogleSheets and I just figured out that the start_index and end_index fields of the range:CellIndexRange1D parameter to the delete_rows! function are zero-based, and end_index is exclusive.

I find this surprising because all the ranges I know of, in both Google Sheets and Julia, are one-based and inclusive, and the similarly named CellRange uses the traditional A1 notation. After digging down through the layers of abstraction and looking for clues, I eventually found confirmation here: https://developers.google.com/sheets/api/reference/rest/v4/DimensionRange

I'm not sure if this applies to all instances of CellIndexRange1D, or whether it's restricted to certain use cases like delete_rows!.

Even though this is ultimately a Google Sheets API peculiarity, perhaps a note in the documentation would help clarify a pretty fundamental question for users of this library.