RFR: 7903289: the option '-tagspec' in jtreg doesn't work as expected

[Guoxiong Li]

Hi all,

When using the command `jtreg -tagspec`, jtreg replies `The Tag Specification is not available`. It is because the file `tag-spec.txt` has not exsited after commit [ae6b9001](https://github.com/openjdk/jtreg/commit/ae6b9001). This patch fixes it by providing the `tag-spec.html` file link.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - CODETOOLS-7903289

Changes: https://git.openjdk.org/jtreg/pull/113/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=113&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903289
  Stats: 9 lines in 2 files changed: 0 ins; 4 del; 5 mod
  Patch: https://git.openjdk.org/jtreg/pull/113.diff
  Fetch: git fetch https://git.openjdk.org/jtreg pull/113/head:pull/113

PR: https://git.openjdk.org/jtreg/pull/113