RFR: 8320279: Link issues in java.xml module-info.java

[Joe Wang]

Doc-only change: fix incorrect links in module-info.java and StAX factories.

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Commit messages:
 - 8320279: Link issues in java.xml module-info.java

Changes: https://git.openjdk.org/jdk/pull/17093/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17093&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320279
  Stats: 20 lines in 5 files changed: 0 ins; 0 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/17093.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17093/head:pull/17093

PR: https://git.openjdk.org/jdk/pull/17093