Add link to image in Dockerhub

[steren]

Mainly for consistency with other samples.

[samodell]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: samodell, steren

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

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [samodell]

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

[adrcunha]

Build tests are failing because:

I0110 23:28:26.564] serving/samples/helloworld-go/README.md:141: MD007 Unordered list indentation

Open the full log and you'll see this line.

[steren]

I do not see what's wrong on line 141.

Please send a commit in the branch to fix the issue, as I do not know how to fix this.

[samodell]

/lgtm

[samodell]

The documentation for the linter says that 2 spaces must be used for indented items in a list, but if you do that, it breaks the numbering for the ordered list, and the linter still had complaints about list formatting.

@adrcunha Is there a way to disable the linter but keep the link checker active? We have the Prettier bot, which does a lot of the same markdown improvements and wasn't impeding workflow.

[samodell]

/retest

[samodell]

/lgtm