geps: Add the missing trailing backtick to gep-3155

[timflannagan]

This commit adds the missing backtick to the gep-3155 index.md to fix markdown rendering.

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This is a quick cleanup PR that adds the missing backtick to json field tag in the gep-3155's index.md. This fixes markdown rendering of this GEP when viewed in the UI or an IDE that supports markdown previewing.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @timflannagan. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

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-sigs/prow repository.

[robscott]

Thanks @timflannagan!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, timflannagan

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• geps/OWNERS [robscott]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[timflannagan]

Looks like we hit the 2h timeout for the verify prowjob, but nothing stands out.

/retest

[timflannagan]

/hold cancel