Documentation does not reference secretKeyRef.name or secretKeyRef.value

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1

I was working through the CKAD mock test by CNCF on Killer Shell and question 14 goes like this:

Create a new Secret secret1 which contains user=test and pass=pwd. The Secret’s content should be available in Pod secret-handler as environment variables SECRET1_USER and SECRET1_PASS.

The provided solution configures the pod like so:

    - name: SECRET1_USER              # add
      valueFrom:                      # add
        secretKeyRef:                 # add
          name: secret1               # add
          key: user                   # add
    - name: SECRET1_PASS              # add
      valueFrom:                      # add
        secretKeyRef:                 # add
          name: secret1               # add
          key: pass                   # add

However, searching the Kubernetes documentation for secretKeyRef does not yield any references to this structure, except for:

For each container in your Pod specification, add an environment variable for each Secret key that you want to use to the env[].valueFrom.secretKeyRef field

But this text doesn’t provide the name & value structure referenced in the mock test solution.

Have I got this wrong or is this a gap in the docs?