RFR: 8281103: Give example for Locale that is English and follows the ISO standards

[Justin Lu]

Please review this PR which adds an example snippet to `java.time.temporal.WeekFields.of(Locale locale)`

The snippet demonstrates how to create a Locale that has English Locale qualities with an ISO-8601 first day of the week. 

This snippet was added as there was a desire for an English/ISO-8601 Locale constant to be added, but the existing methods in the JDK are better suited for accomplishing this.

-------------

Commit messages:
 - Correct param in example
 - Copyright year
 - JDK-8281103

Changes: https://git.openjdk.org/jdk/pull/13893/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13893&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281103
  Stats: 9 lines in 1 file changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13893.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13893/head:pull/13893

PR: https://git.openjdk.org/jdk/pull/13893