RFR: JDK-8294471: SpecTaglet is inconsistent with SpecTree for inline property

[Jonathan Gibbons]

Please review a simple update so that the `SpecTaglet` does not identify as supporting usage of an inline tag.

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Commit messages:
 - JDK-8294471: SpecTaglet is inconsistent with SpecTree for inline property

Changes: https://git.openjdk.org/jdk/pull/10456/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10456&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294471
  Stats: 4 lines in 3 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/10456.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10456/head:pull/10456

PR: https://git.openjdk.org/jdk/pull/10456