Removed note in std::net to use now-deprecated old_io module

[tanadeau]

r? @alexcrichton

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[killercup]

#23375 removes the same stuff from the IO docs, but this PR also removes the hint from the net docs.

[tanadeau]

@killercup Thanks. I'll redo the commit to just have the net changes.

[tanadeau]

Commit updated to just have std::net changes

[alexcrichton]

@bors: r+ rollup

[bors]

@bors r=alexcrichton d14728a

[bors]

⌛ Testing commit d14728a with merge cd3faf3...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-32-nopt-t, auto-win-32-opt, auto-win-64-nopt-t, auto-win-64-opt