[doc] Hello world example in website not work in 0.15.0-dev.888+79db39307

[bronze1man]

Zig Version

0.15.0-dev.888+79db39307

Steps to Reproduce and Observed Behavior

copy and paste hello-world.zig from https://ziglang.org/learn/samples/ into https://godbolt.org/ zig and zig trunk.

const std = @import("std");

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();
    try stdout.print("hello world!\n", .{});
}

got

./example.zig:4:26: error: root source file struct 'Io' has no member named 'getStdOut'
    const stdout = std.io.getStdOut().writer();
                   ~~~~~~^~~~~~~~~~
/opt/compiler-explorer/zig-master/lib/std/Io.zig:1:1: note: struct declared here
const std = @import("std.zig");
^~~~~
referenced by:
    callMain [inlined]: /opt/compiler-explorer/zig-master/lib/std/start.zig:681:37
    callMainWithArgs [inlined]: /opt/compiler-explorer/zig-master/lib/std/start.zig:641:20
    posixCallMainAndExit: /opt/compiler-explorer/zig-master/lib/std/start.zig:596:36
    2 reference(s) hidden; use '-freference-trace=5' to see all references
Compiler returned: 1

The page of https://ziglang.org/learn/samples/ do not say it works on which version of zig.

Expected Behavior

output Hello, World!