Update bark doc (#25234)
* add mention to optimization in Bark docs
* add offload mention in docs
* Apply suggestions from code review
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
* Update bark docs.
* Update bark.md
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Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
