Fix OTA API documentation: use X-API-Key header instead of Bearer

The OTA API uses X-API-Key header for authentication, not Authorization: Bearer.
This matches the actual implementation in OtaClient.cs and ApiKeyAuthenticationHandler.cs.

Author: nickprotop

cloud/src/www/docs/ota.html

@@ -877,7 +877,7 @@ <h2 id="api">API Format</h2>
 
                 <h3>Endpoint</h3>
                 <pre><code>GET /api/ota/{owner}/{project}/bundle
-Authorization: Bearer lrm_your_api_key</code></pre>
+X-API-Key: lrm_your_api_key</code></pre>
 
                 <h3>Response Format</h3>
                 <pre><code>{