8361519: Obsolete Unicode Scalar Value link in Character class

[naotoj]

Refining the description of "Unicode Scalar Value" in the Character class.
The original description referenced the outdated Unicode 3.1 specification, which previously included the U+xxxx notation but no longer does. Updated the reference to point to the Unicode glossary, which defines the term more accurately. Additionally, replaced the obsolete @spec link to Unicode 3.1.0 with a reference to the current Unicode Character Database.

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Issue

• JDK-8361519: Obsolete Unicode Scalar Value link in Character class (Bug - P4)

Reviewers

• Iris Clark (@irisclark - Reviewer)

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[openjdk]

@naotoj This change now passes all automated pre-integration checks.

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8361519: Obsolete Unicode Scalar Value link in Character class

Reviewed-by: iris

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At the time when this comment was updated there had been 68 new commits pushed to the master branch:

• ec3bb93: 8358623: Avoid unnecessary data copying in ICC_Profile
• 39c9de2: 8359958: Cleanup "local" debuggee references after JDK-8333117 removed support for non-local debuggees
• 05c9eec: 8361214: An anonymous class is erroneously being classify as an abstract class
• ... and 65 more: https://git.openjdk.org/jdk/compare/38f59f84c98dfd974eec0c05541b2138b149def7...master

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[mlbridge]

Webrevs

• 01: Full - Incremental (69089cbc)
• 00: Full (44cf51fa)

[irisclark]

Looks good.

Since this appears to be the only reference to Unicode 3.1.0 in the repo, this change should drop the line referencing "Unicode 3.1.0" in the list of external specifications, e.g.:

https://download.java.net/java/early_access/jdk26/docs/api/external-specs.html