docs(config set): fixing glab config set helper messages

Michele Allevirequested to merge
allevimi/cli:patch-1 into main

Description

Fixing the helper message on glab config set

if I'm using --hostname, I will receive this error

   ERROR

  Unknown flag: --hostname.

  Try --help for usage.

and if I'm using -h, I will receive helper message, cause -h --help Show help for this command.

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