Update index.md

Author: Zack-83

en/index.md

@@ -18,7 +18,7 @@ Register for our public mailing list, to be always updated: [[email protected]
 
 Register for the public mailing list of the Content Group, to contribute to the development of catalogues and other material - no programming experience required! [[email protected]](https://www.listserv.dfn.de/sympa/subscribe/rdmo-contentgruppe)
 
-Register to our group chat, for sorking together and for troubleshooting: [RDMO-Slack](https://rdmo.slack.com/signin)
+Register to our group chat, for working together and for troubleshooting: [RDMO-Slack](https://rdmo.slack.com/signin)
 
 
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