Typo in ReferenceGrant documentation.

[jtmckay2017]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
There is a typo in the documentation for ReferenceGrant. Using the example does not work unless you change networking.gateway.k8s.io -> gateway.networking.k8s.io in the from.group field.

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jtmckay2017 / name: Joel McKay (9a9bd35)

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[k8s-ci-robot]

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[youngnick]

Thanks @jtmckay2017!

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jtmckay2017, youngnick

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