bt: fix typo in documentation
@@ -291,7 +291,7 @@ void esp_vhci_host_register_callback(const esp_vhci_host_callback_t *callback);
/** @brief esp_bt_controller_mem_release
* release the memory by mode, if never use the bluetooth mode
- * it can release the .bbs, .data and other section to heap.
+ * it can release the .bss, .data and other section to heap.
* The total size is about 70k bytes.
*
* esp_bt_controller_mem_release(mode) should be called only before esp_bt_controller_init()
