docs: corrected typo event_handler

esp_http_client_config_t has member event_handler not event_handle

Merges https://github.com/espressif/esp-idf/pull/2662

docs/en/api-reference/protocols/esp_http_client.rst

@@ -53,7 +53,7 @@ Application Example
 
         esp_http_client_config_t config = {
            .url = "http://httpbin.org/redirect/2",
-           .event_handle = _http_event_handle,
+           .event_handler = _http_event_handle,
         };
         esp_http_client_handle_t client = esp_http_client_init(&config);
         esp_err_t err = esp_http_client_perform(client);