documentation: fix data types table formatting

documentation/grist-data-format.md

@@ -124,6 +124,9 @@ Note that this combination of rules allows tables and column names to be valid i
 
 ## Value Types
 
+> [!WARNING]
+> This section is out of date.
+
 The format supports a number of data types. Some types have a short representation (e.g. `Numeric` as a JSON `number`, and `Text` as a JSON `string`), but all types have an explicit representation as well.
 
 The explicit representation of a value is an array `[typeCode, args...]`. The first member of the array is a string code that defines the type of the value. The rest of the elements are arguments used to construct the actual value.
@@ -131,6 +134,7 @@ The explicit representation of a value is an array `[typeCode, args...]`. The fi
 The following table lists currently supported types and their short and explicit representations.
 
 | **Type Name**    | **Short Repr** | **[Type Code, Args...]**      | **Description**                                                                                                               |
+|------------------|----------------|-------------------------------|-------------------------------------------------------------------------------------------------------------------------------|
 | `Numeric`        | `number`*      | `['n',number]`                | double-precision floating point number                                                                                        |
 | `Text`           | `string`*      | `['s',string]`                | Unicode string                                                                                                                |
 | `Bool`           | `bool`*        | `['b',bool]`                  | Boolean value (true or false)                                                                                                 |