Update submodules for link fixes

- [rust-embedded](rust-embedded/book@79ab777...ca8169e) - [cargo](rust-lang/cargo@12db56c...79b397d)
Dylan-DPC-zz · Oct 16, 2020 · b221819 · b221819
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commit b221819
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diff --git a/src/doc/embedded-book b/src/doc/embedded-book
diff --git a/src/tools/cargo b/src/tools/cargo