docs: add elysia-better-session to overview.md

[0x0arash]

Summary by CodeRabbit

• Documentation
  • Added "elysia-better-session" to the official plugins documentation — a server-side session management plugin offering flexible session handling with support for multiple configurable store adapters.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

Added a new official plugin entry "elysia-better-session" to the plugins overview documentation, describing a server-side session management plugin with support for multiple store adapters.

Changes

Cohort / File(s)	Summary
Documentation docs/plugins/overview.md	Inserted "elysia-better-session" into the Official plugins list with a short description about server-side session management and different store adapters.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• elysiajs/documentation#731: Also adds new plugin entries to the Official plugins list in the same documentation file.

Poem

🐰 I hopped through docs with nimble feet,
A session plugin now snug and neat,
Adapters ready, stores in line,
Keep your sessions safe and fine,
Hooray — the overview's feeling complete!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding the 'elysia-better-session' plugin entry to the overview.md documentation file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/plugins/overview.md`:
- Line 136: Update the plugin description for "elysia-better-session" to
hyphenate the compound adjective: change "server side session management" to
"server-side session management" in the entry referencing elysia-better-session
so the compound modifier correctly precedes "session management".