RFR: Fix links to #trivial-changes [v3]

[Alexey Ivanov]

On Thu, 7 Aug 2025 11:14:13 GMT, Manuel Hässig <mhaessig at openjdk.org> wrote:

>> This simple PR fixes broken links to the "Trivial Changes" section.
>
> Manuel Hässig has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/guide/testing-the-jdk.md
>   
>   Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>

Changes requested by aivanov (no project role).

src/guide/testing-the-jdk.md line 292:

> 290: ProblemListing and `@ignore`-ing are done in the JDK source tree, that means a check-in into the repository is needed. This in turn means that a unique JBS issue and a code review are needed. This is a good thing since it makes test problems visible.
> 291: 
> 292: * **Code review**: ProblemListing a test is considered a [trivial change]#trivial-changes).

Suggestion:

* **Code review**: ProblemListing a test is considered a [trivial change](#trivial-changes).

Now the opening parenthesis is missing.

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PR Review: https://git.openjdk.org/guide/pull/156#pullrequestreview-3096602428
PR Review Comment: https://git.openjdk.org/guide/pull/156#discussion_r2259960730