### What this PR does / why we need it? add notes for OOM in faqs. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? CI passed --------- Signed-off-by: zzzzwwjj <1183291235@qq.com> Signed-off-by: Yikun Jiang <yikunkero@gmail.com> Co-authored-by: Yikun Jiang <yikunkero@gmail.com>