docs: fix Slack link
Description
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Checklist
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the MR description has been reviewed -
this MR contains text changes and they have been reviewed OR there are no texts changes -
this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes -
this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes
Edited by Anatoly Stansler