fix: upgrade heading levels in common dev templates (zh+en)#1707

Milir-Radxa merged 3 commits into

radxa-docs:mainradxa-docs/docs:mainfrom

tangzz-radxa:support/rock4b-manjaro-memory-heading-20260420tangzz-radxa/docs:support/rock4b-manjaro-memory-heading-20260420Copy head branch name to clipboard