Nested code blocks have wrong indentation

[bmorelli25]

1. Item 1

    1. Item 1a
    ```json
    Do something1
    ```

The do something code block contents should not be indented that far. This bug is magnified the deeper a code block is nested. The actual code block nesting itself is working as expected.

Another example:

This is from the ES book: http://localhost:5000/remote-clusters-api-key.html#remote-clusters-security-api-key-remote-action

[reakaleek]

Fixed by #345