RFR: JDK-8287674: CSS improvements for summary lists [v2]

[Hannes Wallnöfer]

> This is a refinement of CSS styles mostly in the deprecated and new API pages.
> 
>  - Provide a two-row table view for the new sortable three-column tables
>  - Make sure no line wraps are inserted between a checkbox and its label
>  - Slightly increase the line height of the check box row to make it easier to use when wrapped
>  - Define the overflow of summary table cells as "auto" which makes them scrollable if necessary

Hannes Wallnöfer has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8975/files
  - new: https://git.openjdk.java.net/jdk/pull/8975/files/d595fd7c..d595fd7c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8975&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8975&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8975.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8975/head:pull/8975

PR: https://git.openjdk.java.net/jdk/pull/8975