Fix formatting in y-partyserver CHANGELOG

Remove extraneous blank lines and tidy list formatting in packages/y-partyserver/CHANGELOG.md to improve readability of the patch notes.

Author: threepointone

package-lock.json

@@ -35,7 +35,6 @@
 - [#341](https://github.com/cloudflare/partykit/pull/341) [`e7f4b51`](https://github.com/cloudflare/partykit/commit/e7f4b51198904273befb1d39478840c628f6e2b1) Thanks [@threepointone](https://github.com/threepointone)! - Fix Yjs hibernation support and awareness propagation
 
   **Server:**
-
   - Replace in-memory `WSSharedDoc.conns` Map with `connection.setState()` and `getConnections()` so connection tracking survives Durable Object hibernation
   - Move event handler registration from `WSSharedDoc` constructor into `onStart()` to use `getConnections()` for broadcasting
   - Disable awareness protocol's built-in `_checkInterval` in `WSSharedDoc` constructor to prevent timers from defeating hibernation
@@ -45,7 +44,6 @@
   - Widen `onLoad()` return type to `Promise<YDoc | void>` to allow seeding the document from a returned YDoc
 
   **Provider:**
-
   - Switch awareness event listener from `"update"` to `"change"` so clock-only heartbeat renewals do not produce network traffic (allows DO hibernation during idle sessions)
   - Disable awareness protocol's built-in `_checkInterval` on the client to stop 15-second clock renewals and 30-second peer timeout removal
   - Remove provider's own `_checkInterval` liveness timer (was coupled to the awareness heartbeat)
@@ -380,14 +378,12 @@
 ### Patch Changes
 
 - [`528adea`](https://github.com/threepointone/partyserver/commit/528adeaced6dce6e888d2f54cc75c3569bf2c277) Thanks [@threepointone](https://github.com/threepointone)! - some fixes and tweaks
-
   - getServerByName was throwing on all requests
   - `Env` is now an optional arg when defining `Server`
   - `y-partyserver/provider` can now take an optional `prefix` arg to use a custom url to connect
   - `routePartyKitRequest`/`getServerByName` now accepts `jurisdiction`
 
   bonus:
-
   - added a bunch of fixtures
   - added stubs for docs