Rewrite a couple `Receiver` doc examples.#42372

Merged

bors merged 2 commits intorust-lang:masterfrom

frewsxcv:frewsxcv/improve-receiver-docs

Jun 3, 2017

Commits on Jun 2, 2017

Rewrite `Receiver::iter` doc example to show resulting values.
frewsxcv
committed
Rewrite `Receiver::try_iter` doc example to show resulting values.
frewsxcv
committed