out_s3: Suppress warnings from markdownlint

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

pipeline/outputs/s3.md

@@ -45,7 +45,7 @@ The [Prometheus success/retry/error metrics values](../../administration/monitor
 | `sts_endpoint` | Custom endpoint for the STS API. | _none_ |
 | `profile`   | Option to specify an AWS Profile for credentials.   | `default` |
 | `canned_acl` | [Predefined Canned ACL policy](https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl) for S3 objects. | _none_ |
-| `compression` | Compression/format for S3 objects. Supported: `gzip` (always available) and `parquet` (requires Arrow build). For `gzip`, the `Content-Encoding` header is set to `gzip`. `parquet` is available **only when Fluent Bit is built with `-DFLB_ARROW=On`** and Arrow GLib/Parquet GLib are installed. Parquet is typically used with `use_put_object On`. | *none*  |
+| `compression` | Compression/format for S3 objects. Supported: `gzip` (always available) and `parquet` (requires Arrow build). For `gzip`, the `Content-Encoding` header is set to `gzip`. `parquet` is available _only when Fluent Bit is built with `-DFLB_ARROW=On`_ and Arrow GLib/Parquet GLib are installed. Parquet is typically used with `use_put_object On`. | _none_  |
 
 | `content_type` | A standard MIME type for the S3 object, set as the Content-Type HTTP header. | _none_ |
 | `send_content_md5` | Send the Content-MD5 header with `PutObject` and UploadPart requests, as is required when Object Lock is enabled. | `false` |