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506: book: Add note to remember to choose target r=AfoHT a=CuriouslyCurious

While following the instructions in the book I ran into a wall. I was getting linker errors and had no idea why. Turns out trying to run `cargo build --example init` on an x86 build target maybe doesn't work too well, so I added a note about it. 😅

I'll leave this as a draft since my Russian isn't fluent enough to add the note there as well. Also, adding a modified version of `.config/cargo.toml` from the embedded example might be a decent idea but wanted to hear from you guys first. :P

Co-authored-by: CuriouslyCurious <thecuriouslycurious@protonmail.com>
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6
book/en/src/by-example/app.md
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@ -53,6 +53,12 @@ $ cargo run --example init
{{#include ../../../../ci/expected/init.run}}
```
> **NOTE**: Remember to specify your chosen target device by passing a target
> triple to cargo (e.g `cargo run --example init --target thumbv7m-none-eabi`) or
> configure a device to be used by default when building the examples in `.cargo/config.toml`.
> In this case, we use a Cortex M3 emulated in QEMU so the target is `thumbv7m-none-eabi`.
> See [`Starting a new project`](./new.md) for more info.
## `idle`
A function marked with the `idle` attribute can optionally appear in the