Fix Anchor for installing Gateway API CRD manually on Getting Started Guide

[akankshakumari393]

Fixes #1403

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[k8s-ci-robot]

Hi @akankshakumari393. Thanks for your PR.

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[youngnick]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akankshakumari393, youngnick

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