Fix bad target name in Walkthrough

Walkthrough currently say:

```
rustup target add aarch_64-fuchsia
```
but should say

```
rustup target add aarch64-fuchsia
```
This commit is contained in:
Matt Hamrick 2022-08-31 13:21:47 -07:00 committed by GitHub
parent 4fd4de7ea3
commit a928255ab1
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@ -79,7 +79,7 @@ the following commands:
```sh
rustup target add x86_64-fuchsia
rustup target add aarch_64-fuchsia
rustup target add aarch64-fuchsia
```
After installing our Fuchsia targets, we can now compile a Rust binary that targets