[docs] Fix Incorrect URL in blog `Tiering Service Deep Dive`

[beryllw]

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Fluss version

main (development)

Please describe the bug 🐞

https://github.com/gyang94/fluss/blob/7d369e725475ee22c188bd9b66fa78e272028fdc/website/blog/2025-07-01-tiering-service.md?plain=1#L59-L60
May be correct url is https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface.

And TieringSplit has two subclasses: TieringSnapshotSplit and TieringLogSplit.

Solution

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

[beryllw]

@gyang94 cc

[gyang94]

@beryllw Thanks for your checking. Made a PR to fix this, please check.