Seems like the 2nd sentence is not collaborating with the 1st one.

You can update, or upgrade, an OpenShift Container Platform cluster within a minor version by using the OpenShift CLI (oc). You can also update a cluster between minor versions by following the same instructions.  

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The doc I'm refering to is at :
https://docs.openshift.com/container-platform/4.14/updating/updating_a_cluster/updating-cluster-cli.html#:~:text=You%20can%20update%2C%20or%20upgrade%2C%20an%20OpenShift%20Container%20Platform%20cluster%20within%20a%20minor%20version%20by%20using%20the%20OpenShift%20CLI%20(oc).%20You%20can%20also%20update%20a%20cluster%20between%20minor%20versions%20by%20following%20the%20same%20instructions.


     

I would expect it to be aligned with the convention of:
update - minor versions
upgrade - major versions