my ziglings
docs: update wrong reference to prior exercise
The comment should reference exercise 109, not 106.
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exercises/110_files2.zig
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exercises/110_files2.zig
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// Get the current working directory
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const cwd = std.Io.Dir.cwd();
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// try to open ./output assuming you did your 106_files exercise
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// try to open ./output assuming you did your 109_files exercise
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var output_dir = try cwd.openDir(io, "output", .{});
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defer output_dir.close(io);
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