GitHub issue: 

https://github.com/openshift/openshift-docs/issues/45754

*Note: When a PR is opened that fixes this issue, add to the PR description: "Fixes #12345" (replace 12345 with the GH issue number). This should automatically close the issue when the PR is merged. 

Which section(s) is the issue in?

https://docs.openshift.com/container-platform/4.8/logging/cluster-logging-external.html#creating-a-secret

What needs fixing?

$ oc create secret generic -n openshift-logging
--from-file=tls.key=<your_key_file>
--from-file=tls.crt=<your_crd_file> < ----- Its should be crt file not crd file
--from-file=ca-bundle.crt=<your_bundle_file>
--from-literal=username=<your_username>
--from-literal=password=<your_password>

$ oc create secret generic -n openshift-logging
--from-file=tls.key=<your_key_file>
--from-file=tls.crt=<your_crt_file>
--from-file=ca-bundle.crt=<your_bundle_file>
--from-literal=username=<your_username>
--from-literal=password=<your_password>