RFR: 8338833: Error on reference not found for a snippet target [v2]

[Hannes Wallnöfer]

> Please review a trivial fix to generate an error when a link in a snippet has an invalid target.

Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:

  Remove assert that prevents invalid tag markup and rename variable

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25329/files
  - new: https://git.openjdk.org/jdk/pull/25329/files/1e220061..dfd43e23

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25329&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25329&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25329.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25329/head:pull/25329

PR: https://git.openjdk.org/jdk/pull/25329