Update comment in Vec::dedup_by

[flodiebold]

It's a tiny thing, but I came across this comment which previously was in dedup and wasn't updated when dedup_by was introduced.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @sfackler (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. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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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[sfackler]

@bors r+ rollup

Thanks!

[bors]

📌 Commit 187ddf3 has been approved by sfackler

[bors]

⌛ Testing commit 187ddf3 with merge 07fd313...

[bors]

💔 Test failed - auto-mac-64-opt-rustbuild

[alexcrichton]

@bors: retry

On Sun, Oct 16, 2016 at 9:51 AM, bors notifications@github.com wrote:

💔 Test failed - auto-mac-64-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-mac-64-opt-rustbuild/builds/2736

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