RFR: 8358634: RISC-V: Fix several broken documentation web-links

[Fei Yang]

On Thu, 5 Jun 2025 03:08:14 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> Please take a look and review this PR, thanks!
> 
> Several RISC-V related documentation web-links are broken.
> This PR updates the web-links.

Looks good and trivial. Thanks1

-------------

Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25652#pullrequestreview-2898751102