Copy fix

Author: kbx81

content/components/usb_cdc_acm.md

@@ -28,8 +28,8 @@ usb_cdc_acm:
 
 - **usb_rx_buffer_size** (*Optional*, int): Size of the USB receive buffer in bytes. Range: 1-65535. Defaults to `256`.
 - **usb_tx_buffer_size** (*Optional*, int): Size of the USB transmit buffer in bytes. Range: 1-65535. Defaults to `256`.
-- **interfaces** (**Optional**, list): List of CDC-ACM interface instances to configure. Up to two are supported; at
-  least one is required. Defaults to a single-item list which defines interface zero (`number: 0`) only.
+- **interfaces** (**Optional**, list): List of CDC-ACM interface instances. Up to two are supported; at least one is
+  required. Defaults to a single-item list which defines a single interface only.
 
 ## Interface configuration variables