Clarification on the correct usage of `defineField` and `defineArrayMember` in a Slack thread.

defineField({
      title: "Navigation",
      description: "Select pages or link for main navigation",
      name: "navigation",
      type: "array",
      group: "navigation",
      of: [
        defineField({
          title: "Internal Link",
          name: "internalLink",
          type: "internalLink"
        }),
        defineField({
          title: "External Link",
          name: "externalLink",
          type: "externalLink"
        })
      ]
    }),