Update content/operate/rs/installing-upgrading/upgrading/upgrade-cluster.md

Co-authored-by: David Dougherty <[email protected]>

Author: rrelledge

content/operate/rs/installing-upgrading/upgrading/upgrade-cluster.md

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-Before you upgrade a cluster to a later Redis Software version, review the [supported upgrade paths](##supported-upgrade-paths) and [prerequisites](#upgrade-prerequisites).
+Before you upgrade a cluster to a later Redis Software version, review the [supported upgrade paths](#supported-upgrade-paths) and [prerequisites](#upgrade-prerequisites).
 
 To upgrade a cluster's Redis Software version, use one of the following methods: