doc: add example for std::net::lookup_addr

[tshepang]

No description provided.

[rust-highfive]

r? @aturon

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[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit 3e7498d has been approved by steveklabnik

[bors]

💔 Test failed - auto-mac-32-opt

[tshepang]

ah, missing use std::str::FromStr

[alexcrichton]

This should use .parse() instead of the less-idiomatic ::from_str most likely as well.

[tshepang]

Is that more like it @alexcrichton?

[alexcrichton]

@bors: r+ 8569ef2

[bors]

⌛ Testing commit 8569ef2 with merge 7b77f67...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt