Add Swift and PHP retry snippets, verified retry support exists

- Added Swift examples for client-level and request-level retry configuration
- Added PHP examples for client-level and request-level retry configuration
- Verified retry support exists in generated SDKs before adding examples
- Ruby retry support not implemented (parameter exists but not used in RawClient)

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

Author: devin-ai-integration[bot]

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

@@ -77,6 +77,25 @@ default retry limit when instantiating the client.
     });
     ```
   </CodeBlock>
+  <CodeBlock title="Swift">
+    ```swift {4}
+    import Imdb
+
+    let client = ImdbClient(
+      baseURL: "https://api.imdb.com",
+      maxRetries: 1 // overrides the default retry limit to 1
+    )
+    ```
+  </CodeBlock>
+  <CodeBlock title="PHP">
+    ```php {3}
+    use Imdb\ImdbClient;
+
+    $client = new ImdbClient([
+      "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.
@@ -119,5 +138,19 @@ It's also possible to override the retry limit on a per-request basis.
       });
     ```
   </CodeBlock>
+  <CodeBlock title="Swift">
+    ```swift {2}
+      let movie = try await client.movie.get("tt0111161", requestOptions: RequestOptions(
+        maxRetries: 3 // overrides the default retry limit to 3
+      ))
+    ```
+  </CodeBlock>
+  <CodeBlock title="PHP">
+    ```php {2}
+      $movie = $client->movie->get("tt0111161", [
+        "maxRetries" => 3 // overrides the default retry limit to 3
+      ]);
+    ```
+  </CodeBlock>
 </CodeBlocks>