Fix typos.

Author: Enyium

src/doc/book.toml

@@ -1,6 +1,6 @@
 [book]
 title = "The Cargo Book"
-author = "Alex Crichton, Steve Klabnik and Carol Nichols, with Contributions from the Rust Community"
+author = "Alex Crichton, Steve Klabnik and Carol Nichols, with contributions from the Rust community"
 
 [output.html]
 git-repository-url = "https://github.com/rust-lang/cargo/tree/master/src/doc/src"