Corrected the import command in readme
Corrected the incorrectly mentioned `oc import` to `oc import-image` in the custom builder readme section
@@ -237,7 +237,7 @@ Below is an example of how to successfully import and use the [redhat-openjdk-18
```sh
# Import the image into OpenShift
-oc import openjdk18 --from=registry.access.redhat.com/redhat-openjdk-18/openjdk18-openshift --confirm
+oc import-image openjdk18 --from=registry.access.redhat.com/redhat-openjdk-18/openjdk18-openshift --confirm
# Tag the image so it is accessible by Odo
oc annotate istag/openjdk18:latest tags=builder
