RFR: 8372303: Remove obsolete tbom files from /doc-files

[Andy Goryachev]

Removed obsolete `.tbom` files.

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Commit messages:
 - rm tbom

Changes: https://git.openjdk.org/jfx/pull/1979/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1979&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372303
  Stats: 39 lines in 2 files changed: 0 ins; 39 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1979.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1979/head:pull/1979

PR: https://git.openjdk.org/jfx/pull/1979