Update title of Fleets Overview document to reflect General availability

[alefranz]

Given Now Generally Available: Azure Cosmos DB Fleet Pools
this PR updates the title, as I think it was missed in 110431d

/cc @seesharprun

[prmerger-automator]

@alefranz : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change. @deborahc

[prmerger-automator]

@alefranz : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 08b64a9:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/cosmos-db/nosql/fleet.md	✅Succeeded

For more details, please refer to the build report.

[ttorble]

@deborahc

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[seesharprun]

@alefranz, we are publishing an update to documentation today to flatten the /cosmos-db/nosql folder into/cosmos-db. This will cause a merge conflict.

Once that happens, I will take your change and pull it into a new pull request so you get credit for the contribution without having to deal with merge conflicts.

[seesharprun]

The new pull request was created. You should see your change in Git history later today.

[seesharprun]

#please-close