Fixes link to client reference

[psschwei]

Proposed Changes

Fixes the macro that generates the link to the client reference docs.

/cherry-pick release-1.1
/assign @snneji

[netlify]

✔️ Deploy Preview for knative ready!

🔨 Explore the source changes: 87b1c64

🔍 Inspect the deploy log: https://app.netlify.com/sites/knative/deploys/61e4cc2268f3710008f8f768

😎 Browse the preview: https://deploy-preview-4638--knative.netlify.app

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: psschwei

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 [psschwei]

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

[snneji]

/lgtm

[snneji]

/cherry-pick release-1.1

[knative-prow-robot]

@snneji: #4638 failed to apply on top of branch "release-1.1":

Applying: fixes link to client reference
Using index info to reconstruct a base tree...
M	hack/macros.py
Falling back to patching base and 3-way merge...
Auto-merging hack/macros.py
CONFLICT (content): Merge conflict in hack/macros.py
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 fixes link to client reference
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.1

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/test-infra repository.