docs: Fix an outdated admonition format (#1711)

docs/guides/lint-asyncapi.md

@@ -99,13 +99,12 @@ opportunities to make sure that your AsyncAPI spec conforms with expectations
 (we'd also love to see what you're building, it helps us know how things are
 going!).
 
-:::info Custom plugins
-
+{% admonition type="info" name="Custom plugins" %}
 For those users with advanced requirements and JavaScript skills, the [custom
 plugins](../custom-plugins/index.md) feature offers some extension points if you need
 them.
 
-:::
+{% /admonition %}
 
 ## Supported protocols
 

docs/guides/migrate-from-swagger-cli.md

@@ -46,14 +46,8 @@ redocly lint openapi.yml
 
 You can add more [built-in rules](../rules/built-in-rules.md) by adding them in the configuration file, and adjust the level of the messages by using `warn` rather than `error`.
 
-<!-- :::info Redocly configuration -->
-
-<!-- :::info Redocly configuration -->
-
 Learn more about [configuring Redocly CLI](../configuration/index.md) in the documentation.
 
-<!-- ::: -->
-
 ## Bundle OpenAPI/Swagger into a single file
 
 While the OpenAPI (and earlier Swagger) standards were designed to use `$ref` reference syntax and re-use elements of API descriptions across mulitple files, not all tools support this. If there's a tool in your API lifecycle that needs a single file, you can still use mulitple files for the day-to-day work, and then "bundle" the API description into a single file for use by another tool.