[PATCH] doc:fix some typos

[Andrew Jones]

On Wed, Sep 28, 2022 at 10:35:30AM +0800, dominic_riscx at qq.com wrote:
> From: Dunky-Z <254758318 at qq.com>
> 
> Signed-off-by: zhangdongdong <zhangdongdong at eswincomputing.com>
> ---
>  docs/domain_support.md        |  6 +++---
>  docs/library_usage.md         |  2 +-
>  docs/platform_requirements.md |  2 +-
>  docs/pmu_support.md           | 10 +++++-----
>  4 files changed, 10 insertions(+), 10 deletions(-)

Reviewed-by: Andrew Jones <ajones at ventanamicro.com>