Parse any spreadsheet range into a table for GitHub, Obsidian, etc.
Expects a header row.
/* Google Apps Script */
/**
* Select any spreadsheet range, and return a string-parsed table for GitHub, Obsidian, etc.
* Note: Obsidian requires a prefixed empty space for the header row, if the first cell is blank.
* @param {Array<Array>} array2d - The source range.