docs: modify docs for riscv [1/1]

PD#SWPL-131748

Problem:
revise

Solution:
fix

Verify:
N/A

Change-Id: Ibadfe338b5373a81a3c52b784383ce15863100a0
Signed-off-by: shijie.xiong <shijie.xiong@amlogic.com>
18 files changed