Fix docs build failure

[bharath-123]

On master, make build-docs is failing with the following error message.

**UndefinedError**: 'ChannelRecommendedImage' is undefined



Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/macros/plugin.py", line 263, in render
    return md_template.render(**self.variables)
  File "/usr/lib/python3.8/site-packages/jinja2/environment.py", line 1090, in render
    self.environment.handle_exception()
  File "/usr/lib/python3.8/site-packages/jinja2/environment.py", line 832, in handle_exception
    reraise(*rewrite_traceback_stack(source=source))
  File "/usr/lib/python3.8/site-packages/jinja2/_compat.py", line 28, in reraise
    raise value.with_traceback(tb)
  File "<template>", line 19, in top-level template code
  File "/usr/lib/python3.8/site-packages/jinja2/environment.py", line 471, in getattr
    return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'ChannelRecommendedImage' is undefined

Tried adding a bunch of braces around it and got it working somehow....

[k8s-ci-robot]

Hi @bharath-123. Thanks for your PR.

I'm waiting for a kubernetes 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.

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[bharath-123]

/cc @olemarkus

[olemarkus]

Thanks for catching this.

/ok-to-test

[olemarkus]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bharath-123, olemarkus

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[bharath-123]

Do we need to run e2e tests for documentation related changes?

[hakman]

Do we need to run e2e tests for documentation related changes?

No, but it's complicated to skip.