fix rustdoc JS

[hrls]

#58290

[GuillaumeGomez]

Thanks!

Considering the nightly is currently broken, I'll give it a high priority.

@bors: r+ p=2

[bors]

📌 Commit 5288f3f has been approved by GuillaumeGomez

[bors]

⌛ Testing commit 5288f3f with merge e9d2e7d59ae1717cc7ddc54e473220abeb4391e3...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job dist-x86_64-apple of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:01:36]    Compiling serde_derive v1.0.81
[00:01:38]    Compiling serde_json v1.0.33
[00:01:38]    Compiling toml v0.4.10
[00:01:49]    Compiling bootstrap v0.0.0 (/Users/travis/build/rust-lang/rust/src/bootstrap)
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[GuillaumeGomez]

@bors retry

[bors]

⌛ Testing commit 5288f3f with merge 0710c20...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: GuillaumeGomez
Pushing 0710c20 to master...