Fix: expand_wildcards in _refresh API. (opensearch-project#7620)

Signed-off-by: dblock <dblock@amazon.com>

Author: dblock

_api-reference/index-apis/refresh.md

@@ -45,7 +45,7 @@ The following table lists the available query parameters. All query parameters a
 | :--- | :--- | :--- |
 | `ignore_unavailable` | Boolean | When `false`, the request returns an error when it targets a missing or closed index. Default is `false`.
 | `allow_no_indices` | Boolean | When `false`, the Refresh Index API returns an error when a wildcard expression, index alias, or `_all` targets only closed or missing indexes, even when the request is made against open indexes. Default is `true`. |
-| `expand_wildcard` | String | The type of index that the wildcard patterns can match. If the request targets data streams, this argument determines whether the wildcard expressions match any hidden data streams. Supports comma-separated values, such as `open,hidden`. Valid values are `all`, `open`, `closed`, `hidden`, and `none`.
+| `expand_wildcards` | String | The type of index that the wildcard patterns can match. If the request targets data streams, this argument determines whether the wildcard expressions match any hidden data streams. Supports comma-separated values, such as `open,hidden`. Valid values are `all`, `open`, `closed`, `hidden`, and `none`.