fix multiple issues with example table (#1678)

-  backtick instead of single quote
- "summy" instead of "sunny"
- trailing comma at end of last row

Author: dtenenba

book/navigating_structured_data.md

@@ -78,12 +78,13 @@ Daphne
 The next few examples will use the following table:
 
 ```nu
-let data = [[date                        temps                                   condition ];
-            [2022-02-01T14:30:00+05:00,  [ 38.24, 38.50, 37.99, 37.98, 39.10 ],  'summy`   ],
-            [2022-02-02T14:30:00+05:00,  [ 35.24, 35.94, 34.91, 35.24, 36.65 ],  'sunny'   ],
-            [2022-02-03T14:30:00+05:00,  [ 35.17, 36.67, 34.42, 35.76, 36.52 ],  'cloudy'  ],
-            [2022-02-04T14:30:00+05:00,  [ 39.24, 40.94, 39.21, 38.99, 38.80 ],  'rain'    ],
-           ]
+let data = [
+    [date                        temps                                   condition      ];
+    [2022-02-01T14:30:00+05:00,  [38.24, 38.50, 37.99, 37.98, 39.10],   'sunny'       ],
+    [2022-02-02T14:30:00+05:00,  [35.24, 35.94, 34.91, 35.24, 36.65],   'sunny'       ],
+    [2022-02-03T14:30:00+05:00,  [35.17, 36.67, 34.42, 35.76, 36.52],   'cloudy'      ],
+    [2022-02-04T14:30:00+05:00,  [39.24, 40.94, 39.21, 38.99, 38.80],   'rain'        ]
+]
 ```
 
 ::: details Expand for a visual representation of this data