Strings in code block are not ignored by Vale spelling check

In the following code snippet, the example command contains the control character `\n` in the input string. Vale spelling check reported errors on the words concatenated with the preceding character `n`.

Because it's within a code block, the `:vale-ignore:` custom role cannot be used (If used, the error is gone, but the role will be rendered as text). The error can be suppressed by adding the reported string to the custom wordlist, but they should not be accepted words.

```rst
.. code-block:: none

id: network_iface_info
_summary: Fetches information of all network intefaces
plugin: resource
command:
ip -details -json link show | jq -r '
.[] | "interface: " + .ifname +
"\nlink_info_kind: " + .linkinfo.info_kind +
"\nlink_type: " + .link_type +
"\noperstate: " + .operstate + "\n"'
```

```
error The word 'nlink_info_kind' seems to Canonical.000-US-spellcheck misspelled.
error The word 'nlink_type' seems to Canonical.000-US-spellcheck misspelled.
error The word 'noperstate' seems to Canonical.000-US-spellcheck misspelled.
```