RFR: JDK-8307377: Remove use of `tagName` from TagletWriterImpl.linkSeeReferenceOutput

[Jonathan Gibbons]

Please review a simple fix to remove unnecessary detail from in-page and console messages about the name of the tag enclosing a bad reference.

-------------

Commit messages:
 - JDK-8307377: Remove use of `tagName` from TagletWriterImpl.linkSeeReferenceOutput

Changes: https://git.openjdk.org/jdk/pull/13811/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307377
  Stats: 48 lines in 8 files changed: 1 ins; 7 del; 40 mod
  Patch: https://git.openjdk.org/jdk/pull/13811.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13811/head:pull/13811

PR: https://git.openjdk.org/jdk/pull/13811