docs: Sync up CN and EN versions for files in api-guides and hw-reference (Jan)

docs/en/api-guides/dfu.rst

@@ -1,5 +1,5 @@
 Device Firmware Upgrade via USB
-========================================
+===============================
 
 :link_to_translation:`zh_CN:[中文]`
 
@@ -65,7 +65,7 @@ The command below will create a DFU image named ``dfu.bin`` that is placed in th
 .. _api_guide_dfu_flash:
 
 Flashing the DFU Image
-====================================
+======================
 
 The command below will download the DFU image into the {IDF_TARGET_NAME}::
 
@@ -90,7 +90,7 @@ See :ref:`api_guide_dfu_flash_errors` and their solutions.
 
 .. _api_guide_dfu_flash_udev:
 
-Udev Rule (Linux only)
+Udev Rule (Linux Only)
 ----------------------
 
 Udev is a device manager for the Linux kernel. It allows us to run ``dfu-util`` (and ``idf.py dfu-flash``) without ``sudo`` for gaining access to the chip.
@@ -106,7 +106,7 @@ Restart your computer so the previous setting could take into affect or run ``su
 
 .. _api_guide_dfu_flash_win:
 
-USB Drivers (Windows only)
+USB Drivers (Windows Only)
 --------------------------
 
 ``dfu-util`` uses `libusb` to access the device. You have to register on Windows the device with the `WinUSB` driver.
@@ -129,7 +129,6 @@ Common Errors and Known Issues
 
 - Flashing with ``dfu-util`` on Windows fails on the first attempt with error ``Lost device after RESET?``. Please retry the flashing and it should succeed the next time.
 
-
 .. only:: SOC_SUPPORTS_SECURE_DL_MODE
 
     Secure Download Mode