docs: change Tabs stories for activation prop

[pamrulla]

changes as per the explanation given in the issue #17005

No breaking changes

Fix the confusing explanation for activation prop for TabsList component and fix the misspelled activation prop in corresponding stories

Changelog

Changed

• Tabs.mdx change the explanation to activation prop
• Tabs.stories.js fix the automatic argument to activation in Playground story

Testing / Reviewing

Test 1:

1. Run the yarn storybook in packages/react project.
2. Go to overview page of Tabs component
3. Go to the section Tab - tab activation modes
4. Verify the explanation

Test 2:

1. Go to Playground page of Tabs component in storybook
2. Set the activation prop to automatic
3. Focus a tab in the render view.
4. Use Left or Right keys on keyboard to change the tab selection.
5. Verify content in the tabs panel changes correspondingly.
6. Set the activation prop to manual
7. Focus a tab in the render view.
8. Use Left or Right keys on keyboard to change the tab selection.
9. Verify content in the tabs panel does not changes.
10. Select ENTER button on keyboard when the focus is on any tab.
11. Verify content in the tabs panel changes correspondingly.

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[pamrulla]

I have read the DCO document and I hereby sign the DCO.

[alisonjoseph]

Thanks for updating this!

[tay1orjones]

Thanks!