Remove extra spacing in the API Specification aliases

[nuno-faria]

What type of PR is this?

/kind documentation
What this PR does / why we need it:
Removes an extra </p> in the header of alias types.

For instance, HTTPRoute looks like this:

However, AddressType, which is an alias for string, looks like this:

With the fix:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @nuno-faria. Thanks for your PR.

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[robscott]

Great improvement, thanks @nuno-faria!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nuno-faria, robscott

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