Describe the problem

Globals may need their own page alongside parameters, for two reasons:

• it would give them the same level of importance as parameters and would help new users identify and compare both constructs
• we'd have room to expand on how to useGlobals from preview vs MDX vs manager

Additional context

IIRC preview and manager have hooks for accessing and updating globals. This leads to a funky situation where MDX needs its own pattern (MDX cannot always run our API hooks).

https://storybook.js.org/docs/essentials/toolbars-and-globals#globals contains only some doc but not code examples from the perspective of every applicable code context.

#32362 provides a creative approach to use globals from MDX.