Remove ChainIterable usages from quick documentation and replace with HtmlChunk/HtmlBuilder.
I18ize some fragments.
GitOrigin-RevId: c9b1197efcb17de92361426759a7840ee1be8e4b
It's not necessary as in Quick Documentation a definition is wrapped in
<pre/> tag according to new guide lines, and in tooltips line breaks are
preserved thanks to UIUtil.getHtmlBody() used in HintUtil.prepareHintText().