[jdk26] RFR: 8373909: JSpec and ToolGuide taglets use incorrect relative path

[Chen Liang]

On Thu, 18 Dec 2025 17:23:06 GMT, Dan Smith <dlsmith at openjdk.org> wrote:

> This pull request contains a backport of commit [0b271240](https://github.com/openjdk/jdk/commit/0b2712400b55d4a512db225d090c2f06f01f7f1f) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Dan Smith on 18 Dec 2025 and was reviewed by Chen Liang and Hannes Wallnöfer.

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28902#pullrequestreview-3594190033