docs: remove incorrect note from get started of esp32s3

docs/en/get-started/establish-serial-connection.rst

@@ -146,12 +146,16 @@ Sometimes the USB-to-UART bridge is external. This is often used in small develo
 
     The USB on the {IDF_TARGET_NAME} uses the **{IDF_TARGET_USB_PIN_DP}** for **D+** and **{IDF_TARGET_USB_PIN_DM}** for **D-**.
 
-    .. only:: SOC_USB_SERIAL_JTAG_SUPPORTED
+    .. only:: SOC_USB_SERIAL_JTAG_SUPPORTED and not esp32s3
 
         .. note:: The {IDF_TARGET_NAME} supports only *USB CDC and JTAG*.
 
         If you are flashing for the first time, you need to get the {IDF_TARGET_NAME} into the download mode manually. To do so, press and hold the ``BOOT`` button and then press the ``RESET`` button once. After that release the ``BOOT`` button.
 
+    .. only:: esp32s3
+
+        If you are flashing for the first time, you need to get the {IDF_TARGET_NAME} into the download mode manually. To do so, press and hold the ``BOOT`` button and then press the ``RESET`` button once. After that release the ``BOOT`` button.
+
     .. only:: esp32s2
 
         After flashing the binaries, a manual reset is needed.

docs/zh_CN/get-started/establish-serial-connection.rst

@@ -146,12 +146,16 @@
 
     {IDF_TARGET_NAME} 上的 USB 使用 **{IDF_TARGET_USB_PIN_DP}** 作为 **D+**， **{IDF_TARGET_USB_PIN_DM}** 作为 **D-**。
 
-    .. only:: SOC_USB_SERIAL_JTAG_SUPPORTED
+    .. only:: SOC_USB_SERIAL_JTAG_SUPPORTED and not esp32s3
 
         .. note:: {IDF_TARGET_NAME} 仅支持 *USB CDC and JTAG*。
 
         首次烧录需要手动设置 {IDF_TARGET_NAME} 进入下载模式。请按住 ``BOOT`` 按钮，同时按一下 ``RESET`` 按钮。之后，松开 ``BOOT`` 按钮。
 
+    .. only:: esp32s3
+
+        首次烧录需要手动设置 {IDF_TARGET_NAME} 进入下载模式。请按住 ``BOOT`` 按钮，同时按一下 ``RESET`` 按钮。之后，松开 ``BOOT`` 按钮。
+
     .. only:: esp32s2
 
         二进制文件烧录完成后，需要手动进行复位。