Docs: Backup/BackupShard --incremental-from-pos accepts backup name

[shlomi-noach]

This PR documents the changes in vitessio/vitess#14923, --incremental-from-pos accepting a backup name.

There is a lot of noise because of SHA signatures. The relevant changes are mostly in content/en/docs/19.0/user-guides/operating-vitess/backup-and-restore/creating-a-backup.md and otherwise in vtctl and vtctldclient docs.

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[mattlord]

We only need to update the non-auto-generated pages here as the vtctldclient reference pages happen automatically based on the client binary output. I.e. we only need to update the user guide and vtctl[client] pages. Can you please remove the other changes so that it's easier to review?

[shlomi-noach]

We only need to update the non-auto-generated pages here as the vtctldclient reference pages happen automatically based on the client binary output. I.e. we only need to update the user guide and vtctl[client] pages.

That's what happens when I auto-generate the docs. I've been at it for many PRs now, I'm told this "just works" but clearly I didn't make all these changes manually...

[ajm188]

@mattlord see #1602 (comment)

[shlomi-noach]

Looking back at my own comment I don't like how it reads. I'm sorry about that, it gives a wrong impression. At any case, please let me know how to proceed otherwise.

[mattlord]

@mattlord see #1602 (comment)

I did see that but didn't realize that it was still broken. Sorry about that.

[mattlord]

This LGTM (although vtctl in the page's headers feels a bit off now -- we could say vtctld[client] now): https://deploy-preview-1662--vitess.netlify.app/docs/19.0/user-guides/operating-vitess/backup-and-restore/creating-a-backup/#create-an-incremental-backup-with-vtctl

And I approved the vitess PR so as long as we regenerate the docs based on the latest in the PR branch we'll be good.

Thanks!

[shlomi-noach]

This branch is a mess. Replacing with a new PR.