[jdk8u-dev] RFR: 8209052: Low contrast in docs/api/constant-values.html

[psoujany]

Backport e2eab3c1b7d55860e705ae6f924a2a3976f76f48 to JDK8.
Openjdk bug: https://bugs.openjdk.org/browse/JDK-8209052

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Commit messages:
 - Backport e2eab3c1b7d55860e705ae6f924a2a3976f76f48

Changes: https://git.openjdk.org/jdk8u-dev/pull/114/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=114&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8209052
  Stats: 428 lines in 1 file changed: 350 ins; 14 del; 64 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/114.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/114/head:pull/114

PR: https://git.openjdk.org/jdk8u-dev/pull/114