Mention that std::fs::remove_dir_all fails on files #133298
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This is explicitly mentioned for std::fs::remove_file.
It is more likely for a slightly lazy programmer to believe that removing a file would work and that they do not have to distinguish between directories (with contents) and files themself, because of the function's recursive nature and how it distinguishes between files and directories when removing them.
Follow-up for #133183.