Web docs/reference material includes unreleased features

[nivekh]

Information

• OS: Windows
• Version: 0.48.0
• Terminal: Windows Terminal

Describe the bug
Documentation on https://spectreconsole.net/ includes functionality that has not been shipped.

To Reproduce

1. Install the latest version of Spectre.Console (0.48.0)
2. Attempt to use the following documented functionality: https://spectreconsole.net/api/spectre.console/selectionpromptextensions/940dbecf
3. Observe that the functionality does not exist in the current latest release

Expected behavior
Released documentation should match the behaviour of the latest released version, or have some appropriate versioning annotation for upcoming features.

Additional information
This function is also referenced in some examples, like the example under the heading "Choices" here: https://spectreconsole.net/prompts/text

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