docs: Add a note about ROM version in the boot log

Author: 0cici

docs/en/api-guides/startup.rst

@@ -44,7 +44,8 @@ Startup code called from the reset vector determines the boot mode by checking `
 
 .. note::
 
-    During normal boot modes the RTC watchdog is enabled when this happens, so if the process is interrupted or stalled then the watchdog will reset the SOC automatically and repeat the boot process. This may cause the SoC to strap into a new boot mode, if the strapping GPIOs have changed.
+    - During normal boot modes the RTC watchdog is enabled when this happens, so if the process is interrupted or stalled then the watchdog will reset the SOC automatically and repeat the boot process. This may cause the SoC to strap into a new boot mode, if the strapping GPIOs have changed.
+    - During the lifecycle of a chip, multiple Engineering Change Orders (ECOs) may occur. If such changes do not affect the ROM behavior (e.g., modifications limited to fixing digital logic, adjusting analog circuits, or optimizing manufacturing processes), the ROM firmware typically remains unchanged. As a result, the ROM version number printed in the boot log may be lower than the actual chip revision number.
 
 .. only:: esp32
 

docs/zh_CN/api-guides/startup.rst

@@ -44,7 +44,8 @@
 
 .. note::
 
-   正常启动模式下会使能 RTC 看门狗，因此，如果进程中断或停止，看门狗将自动重置 SOC 并重复启动过程。如果 strapping GPIOs 已更改，则可能导致 SoC 陷入新的启动模式。
+   - 正常启动模式下会使能 RTC 看门狗，因此，如果进程中断或停止，看门狗将自动重置 SOC 并重复启动过程。如果 strapping GPIOs 已更改，则可能导致 SoC 陷入新的启动模式。
+   - 芯片在其生命周期内可能会进行多次工程变更 (ECO)，如工程变更不影响 ROM 行为，例如，仅用于修复数字逻辑、调整模拟电路或优化生产工艺等， ROM 固件往往不会变动。因此启动日志中 ROM 打印的版本号可能低于实际芯片版本号。
 
 .. only:: esp32