Update README.md

[ah-cog]

The link to SSL certificate concepts was broken. I updated the link.

[k8s-ci-robot]

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📝 Please follow instructions at https://git.k8s.io/community/CLA.md#the-contributor-license-agreement to sign the CLA.

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[ah-cog]

Here's a screenshot of the page pointed to by the broken link:

[rramkumar1]

@mgub Looks like you need to sign the CLA

[rramkumar1]

@mgub Ping

[ah-cog]

@rramkumar1 Thanks for the ping. I checked out the branch locally with git fetch origin pull/391/head:patch-1, updated my credentials with git commit --amend --reset-author and tried to push the update with git push --force as outline on Step 4 in https://github.com/kubernetes/community/blob/master/CLA.md#the-contributor-license-agreement.

I get an error:

ERROR: Permission to kubernetes/ingress-gce.git denied to mgub.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

The original edit was made directly on GitHub. Any suggestions?

[rramkumar1]

@mgub Are you sure you were pushing to your remote origin and not upstream?

[bowei]

/ok-to-test