RFR: JDK-8274744: TestSnippetTag test fails after recent integration

[Jonathan Gibbons]

Please review the update to `TestSnippetTag.java`, to update the "expected error"  lines and caret positions, due to the improvements in JDK-8273244.

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Commit messages:
 - JDK-8274744: TestSnippetTag test fails after recent integration

Changes: https://git.openjdk.java.net/jdk/pull/5812/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5812&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274744
  Stats: 35 lines in 2 files changed: 0 ins; 2 del; 33 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5812.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5812/head:pull/5812

PR: https://git.openjdk.java.net/jdk/pull/5812