Add Tabs section to Docs site style guide
What does this MR do and why?
Adds a section to the Documentation style guide about how to use the new Tabs component.
Related: gitlab-docs!2904 (merged)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Sarah German