RFR: JMC-7258: Use the public XLST classes for the release notes [v2]

[Patrick Reinhart]

> Signed-off-by: Patrick Reinhart <patrick at reini.net>

Patrick Reinhart has updated the pull request incrementally with one additional commit since the last revision:

  Integrated review feedback
  
  Signed-off-by: Patrick Reinhart <patrick at reini.net>

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/252/files
  - new: https://git.openjdk.java.net/jmc/pull/252/files/3623024d..32657ecc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=252&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=252&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jmc/pull/252.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/252/head:pull/252

PR: https://git.openjdk.java.net/jmc/pull/252