[enterprise-4.6] Issue in file updating/updating-cluster-between-minor.adoc

[palonsoro]

Which section(s) is the issue in?

The EUS channel documentation shows a link for which the asciidoc syntax is not correct.

What needs fixing?

This:

Extended Update Support[https://access.redhat.com/support/policy/updates/openshift#ocp4_phases] (EUS)

Should become this:
Extended Update Support (EUS)