[Content Bug] Update Function Pipelines page to update references to functions that are no longer experimental

[Loquacity]

Describe the bug

The functions pipelines page includes in its examples some features that are marked as experimental, such as toolkit_experimental.lttb, in https://docs.timescale.com/use-timescale/latest/hyperfunctions/function-pipelines/#pipeline-elements. In practise, some of these functions have been stabilised (see https://docs.timescale.com/api/latest/hyperfunctions/downsampling/#lttb). We need to review this page, check which of the mentioned functions have been stabilised, and update the references to them accordingly.

What do the docs say now?

What should the docs say?

Page affected

[Provide the URL to the page you noticed the bug on]

Subject matter expert (SME)

TBD

Screenshots

[Attach images of screenshots showing the bug]

Any further info

Community Slack thread: https://timescaledb.slack.com/archives/C02LXMKJMMJ/p1691769947409479

Contributing to documentation

We welcome documentation contributions!

• For information about how to propose a change, see the contributing guide in our GitHub repository.
• For information on style and word usage, see the style guide

[github-actions[bot]]

Thank you for the report. We welcome documentation contributions!

• For information about how to propose a change, see the contributing guide in our GitHub repository.
• For information on style and word usage, see the style guide

[billy-the-fish]

@jamessewell, who should I ask to review these experimental functions?