Align cobra help message to capital letter

[yanggangtony]

Signed-off-by: yanggang gang.yang@daocloud.io

Most of cobra help info is begin with "capital letter ".
So we should keep the style the same.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[istio-testing]

Hi @yanggangtony. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[howardjohn]

All the ones referencing commands (most of them) should not be capitalized

[hzxuzhonghu]

could not change this is the command usage,

[yanggangtony]

could not change this is the command usage,

@hzxuzhonghu
thanks for review.
pardon me , i can not get your point.

[zhlsunshine]

could not change this is the command usage,

@hzxuzhonghu thanks for review. pardon me , i can not get your point.

it means that this usage can not work well once you change them with capital letter, such as kube-inject can not be changed as Kube-inject.

[yanggangtony]

@zhlsunshine
thanks for reply . updated.

Or just close pr? If you thinks these is not necessary

[zhlsunshine]

@yanggangtony Yeah, I recommend that close it.