RFR: 8373552: ExactConversionsSupport: bad JLS links in javadoc

[Aggelos Biboudis]

Add relative links to the spec URL of primitive-types-in-patterns-instanceof-switch-jls.html

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Commit messages:
 - 8373552: ExactConversionsSupport: bad JLS links in javadoc

Changes: https://git.openjdk.org/jdk/pull/28775/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28775&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373552
  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/28775.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28775/head:pull/28775

PR: https://git.openjdk.org/jdk/pull/28775