Examples attribute is not repeatable

[jtreminio-dropbox]

Similar to #1298

With annotations this is fine, both nested within an OA\MediaType object or defined at the top-level of a class.

For example, this is fine with annotations:

/**
 * @OA\Examples(example="AccountCreateRequestDefaultExample",
 *     summary="Default Example",
 *     value={
 *         "$ref": "examples/json/AccountCreateRequestDefaultExample.json",
 *     },
 * )
 * @OA\Examples(example="AccountCreateRequestOAuthExample",
 *     summary="OAuth Example",
 *     value={
 *         "$ref": "examples/json/AccountCreateRequestOAuthExample.json",
 *     },
 * )
 */

but this complains about \Attribute::IS_REPEATABLE missing:

#[OA\Examples(example: "AccountCreateRequestDefaultExample",
    summary: "Default Example",
    value: [
        '$ref' => "examples/json/AccountCreateRequestDefaultExample.json",
    ],
)]

#[OA\Examples(example: "AccountCreateRequestOAuthExample",
    summary: "OAuth Example",
    value: [
        '$ref' => "examples/json/AccountCreateRequestOAuthExample.json",
    ],
)]