626: Fix error in book, shared resource need only `Send` r=korken89 a=korken89



Co-authored-by: Emil Fresk <emil.fresk@gmail.com>
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bors[bot] 2022-04-20 11:42:36 +00:00 committed by GitHub
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@ -105,7 +105,7 @@ $ cargo run --target thumbv7m-none-eabi --example lock
{{#include ../../../../ci/expected/lock.run}}
```
Types of `#[shared]` resources have to be both [`Send`] and [`Sync`].
Types of `#[shared]` resources have to be [`Send`].
## Multi-lock