fix(docs): update hello-world.zig for Windows compatibility #440
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Fixes: [issue ziglang#438](ziglang#438) - Hello World sample doesn't work in Windows [(Issue ziglang#438)](ziglang#438) - Declaring a const variable outside the main function fails on target x86_64-windows-gnu [(Issue #6845)](ziglang/zig#6845 (comment)) `getStdOut()` only works at runtime on Windows. This is resolved by moving the `getStdOut()` call into the main function's scope. Additionally, [`ziggzagg.zig`](https://ziglang.org/learn/samples/#zigg-zagg) example on the same page uses the correct approach.
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Description
Fixes: issue #438
Reference
TL;DR
getStdOut()only works at runtime on Windows. This is resolved by moving thegetStdOut()call into the main function's scope. Additionally,ziggzagg.zigexample on the same page uses the correct approach.