alinux: memcg: fix a typo in comment

[haosdent]

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[casparant]

Thanks for helping with improving Cloud Kernel! Your patch looks good except the following two tiny issues:

• Since this is a typo fix against a previous commit, it would be better point out which commit it is and use a 'Fixes:' tag to mention it. In this example, to discover the correct commit id, you can run the following command:

git blame origin/master include/linux/memcontrol.h | grep mecg
c69c12cc10ba9 (Yang Shi               2019-08-02 11:47:44 +0800  161)   bool                    dirty;          /* mecg has too many dirty pages */

Then you can organize your 'Fixes' tag like:

Fixes: c69c12c ("alinux: mm: vmscan: make memcg kswapd set memcg state to dirty or writeback")

• A Signed-off-by: tag should be placed at the bottom of your commit message body.

For more references, you can go to:

• https://alibaba.github.io/cloud-kernel/zh/CONTRIBUTING.html#23-%E6%8F%90%E4%BA%A4%E8%A1%A5%E4%B8%81
• https://www.kernel.org/doc/html/latest/process/submitting-patches.html

Hope that helps,
Caspar