Update changelogs from fern repo (#4430)

Co-authored-by: Swimburger <3382717+Swimburger@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx

@@ -1,3 +1,14 @@
+## 2.50.0
+**`(feat):`** Add exponential backoff reconnection strategy for WebSocket connections.
+A new `ReconnectStrategy` class provides configurable exponential backoff
+(doubling intervals from 1s to 60s), optional random jitter (0-25%) to
+prevent thundering herd, and configurable max attempts. The strategy is
+exposed as a `ReconnectBackoff` property on the generated Options class
+and wired through `WebSocketClient` to `WebSocketConnection.Reconnect()`.
+When max attempts are exhausted, reconnection stops and a disconnection
+event is raised. The backoff resets on successful reconnection.
+
+
 ## 2.49.0
 **`(feat):`** Add per-send timeout to prevent `SendAsync` hangs. A new `SendTimeout` property
 (default: 30 seconds) on `WebSocketConnection` wraps every `SendAsync` call with a