Fix grammar

Remove redundancy word

In D43566#994456, @christopher.davidson_gmail.com wrote:

I have uploaded a pull request to here: https://github.com/openzfs/zfs/pull/15823

I think this one is reasonable.

In D43550#993572, @minsoochoo0122_proton.me wrote:

Hugo Documentation: Alias

/website/content/en/download.adoc.toml

aliases = ['where.adoc']

But this doesn't work. Did I misunderstand the documentation?

It would be better to submit to the upstream https://github.com/openzfs/zfs/ as well, or first.

In D41421#987397, @minsoochoo0122_proton.me wrote:

@lwhsu The Github pull request about CI testing is merged now.

Please be careful with mechanical sweeping change.

I feel that we don't need to modify the old release or reports, we can just have a redirection from /where to /download (actually we should do this for every URL change.)

Also: 41207377e146679495a4562db784402828afac92