linux-user/: fix some comment spelling errors

I found that there are many spelling errors in the comments of qemu,
so I used the spellcheck tool to check the spelling errors
and finally found some spelling errors in the linux-user folder.

Signed-off-by: zhaolichang <zhaolichang@huawei.com>
Reviewed-by: Alex Bennee <alex.bennee@linaro.org>
Message-Id: <20200917075029.313-7-zhaolichang@huawei.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>