Bring playpen.js up to date with @rust-lang/rust@be203ac25836 #35
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I realized Rust code blocks on the generated HTML book do not have the "Run" button. This was because librustdoc/html/static/playpen.js of this crate is not updated for a while.
I copied the latest playpen.js (rust-lang/rust/src/librustdoc/html/static/playpen.js @ be203ac25836) and verified this solved the problem.
Thanks!