Add C# code snippets to retries documentation

Co-Authored-By: Niels Swimberghe <[email protected]>

Author: devin-ai-integration[bot]

fern/products/sdks/guides/retries-with-backoff.mdx

@@ -68,6 +68,15 @@ default retry limit when instantiating the client.
       )
     ```
   </CodeBlock>
+  <CodeBlock title="C#">
+    ```csharp {3}
+    using Imdb;
+
+    var client = new ImdbClient(new ClientOptions {
+      MaxRetries = 1 // overrides the default retry limit to 1
+    });
+    ```
+  </CodeBlock>
 </CodeBlocks>
 
 It's also possible to override the retry limit on a per-request basis.
@@ -103,5 +112,12 @@ It's also possible to override the retry limit on a per-request basis.
       )
     ```
   </CodeBlock>
+  <CodeBlock title="C#">
+    ```csharp {2}
+      var movie = await client.Movie.GetAsync("tt0111161", new RequestOptions {
+        MaxRetries = 3 // overrides the default retry limit to 3
+      });
+    ```
+  </CodeBlock>
 </CodeBlocks>