Update index.md (dynamodb-toolbox#622)

Make readme consistent

Author: Geert

docs/docs/entity/index.md

@@ -85,7 +85,7 @@ For more control over an attribute's behavior, you can specify an object as the
 | prefix       |             `string`             |               `string`                | A prefix to be added to an attribute when saved to DynamoDB. This prefix will be removed when parsing the data.                                                                                                                                 |
 | suffix       |             `string`             |               `string`                | A suffix to be added to an attribute when saved to DynamoDB. This suffix will be removed when parsing the data.                                                                                                                                 |
 | transform    |            `function`            |                  all                  | A function that transforms the input before sending to DynamoDB. This accepts two arguments, the value passed and an object containing the data from other attributes.                                                                          |
-| format       |            `function`            |                  all                  | A function that transforms the DDB output before sending it to the parser. This accepts two arguments, the value of the attribute and an object containing the whole item.                                                                      |
+| format       |            `function`            |                  all                  | A function that transforms the DynamoDB output before sending it to the parser. This accepts two arguments, the value of the attribute and an object containing the whole item.                                                                      |
 | partitionKey |      `boolean` or `string`       |                  all                  | Flags an attribute as the 'partitionKey' for this Entity. If set to `true`, it will be mapped to the Table's `partitionKey`. If set to the name of an **index** defined on the Table, it will be mapped to the secondary index's `partitionKey` |
 | sortKey      |      `boolean` or `string`       |                  all                  | Flags an attribute as the 'sortKey' for this Entity. If set to `true`, it will be mapped to the Table's `sortKey`. If set to the name of an **index** defined on the Table, it will be mapped to the secondary index's `sortKey`                |