docs: correct SARADC_IN4 voltage to 1.8V (max 1.98V) on ROCK 5B - #1987
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The SARADC_IN4 pin is powered by the 1.8V SARADC domain (max 1.98V), not 3.3V. Align with CM5/NX5 hardware interface docs.
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Summary
Fix the GPIO voltage table on the ROCK 5B hardware interface page: SARADC_IN4 is powered by the 1.8V SARADC domain (max 1.98V), not 3.3V.
Motivation
Reported by Radxa hardware colleague: SARADC_IN4 voltage is 1.8V, max 1.98V.
The previous table listed it as 3.3V nominal / 1.8V max, which was incorrect and could mislead customers wiring the SARADC input.
Changes
docs/rock5/rock5b/hardware-design/hardware-interface.md: SARADC_IN4 电压 3.3V → 1.8V, 最高 1.8V → 1.98Vi18n/en/.../rock5/rock5b/hardware-design/hardware-interface.md: same fix in EnglishAligned with the values already published on CM5 / NX5 hardware interface pages.