fix(s3-bridge): properly format bulleted list in field description

rel/i18n/emqx_bridge_s3_upload.hocon

@@ -73,17 +73,17 @@ s3_aggregated_upload_key.desc:
 """Template for the S3 object key of an aggregated upload.<br/>
 Template may contain placeholders for the following variables:
 <ul>
-<li><code>${action}</code>: name of the action (required).<li/>
-<li><code>${node}</code>: name of the EMQX node conducting the upload (required).<li/>
+<li><code>${action}</code>: name of the action (required).</li>
+<li><code>${node}</code>: name of the EMQX node conducting the upload (required).</li>
 <li><code>${datetime.{format}}</code>: date and time when aggregation started, formatted according to the <code>{format}</code> string (required):
     <ul>
-    <li><code>${datetime.rfc3339utc}</code>: RFC3339-formatted date and time in UTC,<li/>
-    <li><code>${datetime.rfc3339}</code>: RFC3339-formatted date and time in local timezone,<li/>
-    <li><code>${datetime.unix}</code>: Unix timestamp.<li/>
+    <li><code>${datetime.rfc3339utc}</code>: RFC3339-formatted date and time in UTC,</li>
+    <li><code>${datetime.rfc3339}</code>: RFC3339-formatted date and time in local timezone,</li>
+    <li><code>${datetime.unix}</code>: Unix timestamp.</li>
     </ul>
-<li/>
-<li><code>${datetime_until.{format}}</code>: date and time when aggregation ended, with the same formatting options.<li/>
-<li><code>${sequence}</code>: sequence number of the aggregated upload within the same time interval (required).<li/>
+</li>
+<li><code>${datetime_until.{format}}</code>: date and time when aggregation ended, with the same formatting options.</li>
+<li><code>${sequence}</code>: sequence number of the aggregated upload within the same time interval (required).</li>
 </ul>
 All other placeholders are considered invalid. Note that placeholders marked as required will be added as a path suffix to the S3 object key if they are missing from the template."""