example: peripherals/usb: fix typo naming of local variables

docs/en/api-reference/peripherals/usb_device.rst

@@ -98,7 +98,7 @@ If the CDC option is enabled in Menuconfig, the USB Serial Device could be initi
 
 .. code-block:: c
 
-    tinyusb_config_cdcacm_t amc_cfg = {
+    tinyusb_config_cdcacm_t acm_cfg = {
         .usb_dev = TINYUSB_USBDEV_0,
         .cdc_port = TINYUSB_CDC_ACM_0,
         .rx_unread_buf_sz = 64,
@@ -107,7 +107,7 @@ If the CDC option is enabled in Menuconfig, the USB Serial Device could be initi
         .callback_line_state_changed = NULL,
         .callback_line_coding_changed = NULL
     };
-    tusb_cdc_acm_init(&amc_cfg);
+    tusb_cdc_acm_init(&acm_cfg);
 
 To specify callbacks you can either set the pointer to your :cpp:type:`tusb_cdcacm_callback_t` function in the configuration structure or call :cpp:func:`tinyusb_cdcacm_register_callback` after initialization.
 

examples/peripherals/usb/tusb_console/main/tusb_console_main.c

@@ -34,8 +34,8 @@ void app_main(void)
     tinyusb_config_t tusb_cfg = { 0 }; // the configuration uses default values
     ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg));
 
-    tinyusb_config_cdcacm_t amc_cfg = { 0 }; // the configuration uses default values
-    ESP_ERROR_CHECK(tusb_cdc_acm_init(&amc_cfg));
+    tinyusb_config_cdcacm_t acm_cfg = { 0 }; // the configuration uses default values
+    ESP_ERROR_CHECK(tusb_cdc_acm_init(&acm_cfg));
 
     ESP_LOGI(TAG, "USB initialization DONE");
     while (1) {

examples/peripherals/usb/tusb_serial_device/main/tusb_serial_device_main.c

@@ -54,7 +54,7 @@ void app_main(void)
     tinyusb_config_t tusb_cfg = {}; // the configuration using default values
     ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg));
 
-    tinyusb_config_cdcacm_t amc_cfg = {
+    tinyusb_config_cdcacm_t acm_cfg = {
         .usb_dev = TINYUSB_USBDEV_0,
         .cdc_port = TINYUSB_CDC_ACM_0,
         .rx_unread_buf_sz = 64,
@@ -64,7 +64,7 @@ void app_main(void)
         .callback_line_coding_changed = NULL
     };
 
-    ESP_ERROR_CHECK(tusb_cdc_acm_init(&amc_cfg));
+    ESP_ERROR_CHECK(tusb_cdc_acm_init(&acm_cfg));
     /* the second way to register a callback */
     ESP_ERROR_CHECK(tinyusb_cdcacm_register_callback(
                         TINYUSB_CDC_ACM_0,