Mention that servers may use ERR_NOSUCHCHANNEL instead of ERR_CHANOPRIVSNEEDED to conceal +s channels#247

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progval wants to merge 2 commits intoircdocs:masterfrom progval:secret-mode

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Commits on Feb 20, 2025

Mention that servers may use ERR_NOSUCHCHANNEL instead of ERR_CHANOPRIVSNEEDED to conceal +s channels
progval
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Commits on Feb 21, 2025

Mention ERR_NOTONCHANNEL too, as many servers do that
progval
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