[material-ui][Tabs] Improve TabContext, TabList, and TabPanel documentation

[DiegoAndai]

The TabContext, TabList, and TabPanel are "mentioned" on the Tab docs in a single demo. These components could use more explanation.

It's also weird that it's so high up on the docs page but have no further explanation and are not mentioned again, this can be very confusing for users.

Issue comes from docs-feedback

[DiegoAndai]

@samuelsycamore where are we storing docs-improvement issues?

[samuelsycamore]

We've got this umbrella issue to track the progress of adding more details about what I'm calling "complementary" components: #39952 - @anle9650 made a nice list for us that includes the Tabs components. 🙏

I think we can follow the same pattern established in the Base UI docs: https://mui.com/base-ui/react-tabs/ - I like using <ComponentCase /> to differentiate between these Tab components because the names are so similar.