fixup! EDU-2113: Coverts Rest API page to MDX

Author: franrob-projects

src/pages/docs/api/rest-api.mdx

@@ -713,7 +713,7 @@ Example request:
 
 <Code language="sh">
 curl https://main.realtime.ably.net/channels \
- -u "{'{{API_KEY}}'}"{""}
+ -u "{'{{API_KEY}}'}"
 </Code>
 
 This will return either a list of channel names, or a [ChannelDetails](/docs/api/realtime-sdk/channel-metadata#channel-details) object depending on what options you've specified.