Update books ## rust-embedded/book 2 commits in 2463edeb8003c5743918b3739a9f6870b86396f5..0789b0f29e73ecb91213cac10ad0eec1b9333770 2026-04-11 08:46:22 UTC to 2026-04-10 14:01:38 UTC - remove IO chapter, is covered in next chapter (rust-embedded/book#411) - add embassy chapter (rust-embedded/book#412) ## rust-lang/reference 10 commits in d2715c07e9dd9839c0c7675ecfa18bec539a6ee9..8c88f9d0bdd75ffdc0691676d83212ae22a18cee 2026-04-20 15:20:24 UTC to 2026-04-07 16:25:09 UTC - typo in example code (rust-lang/reference#2232) - oxford comma (rust-lang/reference#2233) - improve readability (rust-lang/reference#2234) - typo (rust-lang/reference#2230) - Clarify items.fn.generics.param-bounds (rust-lang/reference#2229) - follow formatting style guideline (rust-lang/reference#2228) - Update `derive` export locations (rust-lang/reference#2223) - Clarify that `{self}` imports require a module parent (rust-lang/reference#2221) - stabilize s390x vector registers (rust-lang/reference#2215) - Fix misuse of *usage* throughout the Reference (rust-lang/reference#2222) ## rust-lang/rust-by-example 2 commits in b31e3b8da01eeba0460f86a52a55af82709fadf5..898f0ac1479223d332309e0fce88d44b39927d28 2026-04-19 11:40:28 UTC to 2026-04-19 11:38:45 UTC - remove debug printing for the u32 and bool in variable_bindings.md (rust-lang/rust-by-example#1999) - Update for.md (rust-lang/rust-by-example#2008)

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