[src/doc/book] Update SUMMARY.md
[src/doc/book] Update SUMMARY.md

tshepang/cargo,tsurai/cargo,rust-lang/cargo,achanda/cargo,tsurai/cargo,tshepang/cargo,vojtechkral/cargo,tsurai/cargo,eminence/cargo,tsurai/cargo,nipunn1313/cargo,vojtechkral/cargo,nipunn1313/cargo,nipunn1313/cargo,eminence/cargo,vojtechkral/cargo,tsurai/cargo,rustyhorde/cargo,achanda/cargo,vojtechkral/cargo,nipunn1313/cargo,rust-lang/cargo,rustyhorde/cargo,achanda/cargo,tshepang/cargo,rustyhorde/cargo,rust-lang/cargo,achanda/cargo,tshepang/cargo,eminence/cargo,rust-lang/cargo,eminence/cargo,rustyhorde/cargo