gnus: Summary Group Information

 
 3.27.1 Summary Group Information
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 ‘H d’
      Give a brief description of the current group
      (‘gnus-summary-describe-group’).  If given a prefix, force
      rereading the description from the server.
 
 ‘H h’
      Give an extremely brief description of the most important summary
      keystrokes (‘gnus-summary-describe-briefly’).
 
 ‘H i’
      Go to the Gnus info node (‘gnus-info-find-node’).