[jdk11u-dev] RFR: 8221871: javadoc should not set role=region on <section> elements

[psoujany]

Backport javadoc should not set role=region on <section> elements. 

The bug report for the same : https://bugs.openjdk.org/browse/JDK-8221871

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Commit messages:
 - Backport 0abdc381b72f9dca86ac8f9c8943980eda7fd853

Changes: https://git.openjdk.org/jdk11u-dev/pull/1219/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8221871
  Stats: 74 lines in 5 files changed: 3 ins; 4 del; 67 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1219.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1219/head:pull/1219

PR: https://git.openjdk.org/jdk11u-dev/pull/1219