Fix tests that used // | help: annotations

[fhahn]

In my PR for #21659 I accidentally used // | help as test annotation. This PR updates it to //~| help. I also found and updated 2 other tests with the same issue.

[rust-highfive]

r? @alexcrichton

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[alexcrichton]

Hm out of curiosity, these are actually tested, right? I vaguely remember that at some point in the past these may not have been checked (specifically help, not other errors).

[fhahn]

Yep, they are checked.

[alexcrichton]

@bors: r+ 6ce9ac4

Ok cool, thanks!

[bors]

⌛ Testing commit 6ce9ac4 with merge b035da4...

[bors]

💔 Test failed - auto-linux-64-opt

[alexcrichton]

@bors: retry

On Thu, Jan 14, 2016 at 8:47 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-linux-64-opt
http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/7667

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#30773 (comment).

[bors]

⌛ Testing commit 6ce9ac4 with merge fe04d14...

[bors]

💔 Test failed - auto-linux-64-nopt-t

[alexcrichton]

@bors: retry

On Fri, Jan 15, 2016 at 2:04 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-linux-64-nopt-t
http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/7653

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#30773 (comment).

[bors]

⌛ Testing commit 6ce9ac4 with merge dd51c3a...

[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