Fix relative links

[webwurst]

The links in the last paragraph of https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#rate-limiting don't work as intended. I took over the format from a working link, not totally sure if that is the right way. Feel free to adjust or discard this pull request.

[k8s-ci-robot]

Hi @webwurst. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: webwurst
To complete the pull request process, please assign bowei
You can assign the PR to them by writing /assign @bowei in a comment when ready.

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[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1c42362). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4522   +/-   ##
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  Coverage          ?   59.15%           
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  Files             ?       89           
  Lines             ?     6780           
  Branches          ?        0           
=========================================
  Hits              ?     4011           
  Misses            ?     2335           
  Partials          ?      434

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[aledbf]

/retest

[k8s-ci-robot]

@webwurst: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-ingress-nginx-e2e-1-13	2c09fee	link	/test pull-ingress-nginx-e2e-1-13

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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. I understand the commands that are listed here.