RFR: 8349547: Document jlink and jmods Supported Usage

[Prajwal Kumaraswamy]

Document supported usage of jlink with JDK jmod's
The document will reflect the future work from JDK-8347831

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Commit messages:
 - 8349547: Document jlink and jmods Supported Usage

Changes: https://git.openjdk.org/jdk/pull/23672/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349547
  Stats: 41 lines in 1 file changed: 40 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23672.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23672/head:pull/23672

PR: https://git.openjdk.org/jdk/pull/23672