Add info about terminus 3.3.4.

[kporras07]

Summary

Version Updates - Terminus Release 3.3.4

Effect

The following changes are already committed:

• Update to 3.3.4 terminus#2549

Release:

• When ready

---

Post Launch

Do not remove - To be completed by the docs team upon merge:

• Redirect /old-path/ => /new-path/ (if applicable)
• Include/exclude pages ^ respectively within docs search service provider (if applicable)
• For Heroes - add a props post to the discussion board.
• Remove from the project board

[pantheon-decoupled]

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This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-8872-documentation.appa.pantheon.site
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[kporras07]

Included in #8876