RFR: 8372939: Update JDK 26 spec URLs

[Nizar Benalla]

Updating the JDK 26 JLS and JVMS links

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Commit messages:
 - update jdk 26 spec links

Changes: https://git.openjdk.org/jdk/pull/28605/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28605&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372939
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28605.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28605/head:pull/28605

PR: https://git.openjdk.org/jdk/pull/28605