Auto merge of #6668 - servo:untruncated-docs, r=Ms2ger
Auto merge of #6668 - servo:untruncated-docs, r=Ms2ger

Make doc comments not truncated again.

`rustdoc --passes "collapse-docs unindent-comments"` doesn’t work is intended. It still generate HTML files that look alright at a glance, but all doc-comments are truncated to their first line for some reason I don’t understand.

See http://doc.servo.org/script/dom/index.html for example. The module documentation there is currently just “The implementation of the DOM.”, but clicking the [src] link shows a much larger doc-comment.

The correct invocation is to use `--passes` multiple times.

https://github.com/rust-lang/rust/issues/15347#issuecomment-122785714

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