Fix incorrect capitalization on the "Install kubeadm" page

[reylejano]

The "Install kubeadm" page has an incorrect capitalization in the "Checked Required Ports" section.

You can use telnet to check if a port is open. for example:

Should be

You can use telnet to check if a port is open. For example:

/language en
/kind cleanup
/good-first-issue

[k8s-ci-robot]

@reylejano:
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In response to this:

The "Install kubeadm" page has an incorrect capitalization in the "Checked Required Ports" section.

You can use telnet to check if a port is open. for example:

Should be

You can use telnet to check if a port is open. For example:

/language en
/kind cleanup
/good-first-issue

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.

[reylejano]

/triage accepted

[reylejano]

/remove-kind bug

[aserputov]

Hey, @reylejano could you please assign me ?

[reylejano]

/assign @aserputov