`EvalItem.content` array variant is missing the items schema

[glecaros]

The content property for the EvalItem schema component has an array variant that is missing the description of the items.

content:
  description: |
    Inputs to the model - can contain template strings.
  anyOf:
    - type: string
      title: Text input
      description: |
        A text input to the model.
    - $ref: '#/components/schemas/InputTextContent'
    - type: object
      title: Output text
      description: |
        A text output from the model.
      properties:
        type:
          type: string
          description: |
            The type of the output text. Always `output_text`.
          enum:
            - output_text
          x-stainless-const: true
        text:
          type: string
          description: |
            The text output from the model.
      required:
        - type
        - text
    - type: object
      title: Input image
      description: |
        An image input to the model.
      properties:
        type:
          type: string
          description: |
            The type of the image input. Always `input_image`.
          enum:
            - input_image
          x-stainless-const: true
        image_url:
          type: string
          description: |
            The URL of the image input.
        detail:
          type: string
          description: >
            The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`.
            Defaults to `auto`.
      required:
        - type
        - image_url
    - $ref: '#/components/schemas/InputAudio'
    - type: array
      title: An array of Input text, Input image, and Input audio
      description: >
        A list of inputs, each of which may be either an input text, input image, or input audio
        object.