docs: Update documentation for retrieving a list of all templates (dynamic & legacy) (#717)

Author: renshuki

Diff for: USAGE.md

@@ -4209,7 +4209,7 @@ print $response->statusCode() . "\n";
 print $response->body() . "\n";
 print_r($response->headers());
 ```
-## Retrieve all transactional templates.
+## Retrieve all transactional templates (legacy & dynamic).
 
 **This endpoint allows you to retrieve all transactional templates.**
 
@@ -4221,7 +4221,8 @@ Transactional templates are templates created specifically for transactional ema
 
 
 ```php
-$response = $sg->client->templates()->get();
+$query_params = json_decode('{"generations": "legacy,dynamic"}');
+$response = $sg->client->templates()->get(null, $query_params);
 print $response->statusCode() . "\n";
 print $response->body() . "\n";
 print_r($response->headers());

Diff for: examples/templates/templates.php

@@ -25,7 +25,7 @@
 }
 
 ////////////////////////////////////////////////////
-// Retrieve all transactional templates. #
+// Retrieve all transactional templates (legacy & dynamic). #
 // GET /templates #
 
 $query_params = ['generations' => 'legacy,dynamic'];