Small update to cluster setup docs (#5734)

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**What type of PR is this:**

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/kind documentation

**What does this PR do / why we need it:**

Updates the wording for the cluster setup documentation so it says
requirements not prerequisites.

**Which issue(s) this PR fixes:**
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N/A

**PR acceptance criteria:**

- [X] Documentation

**How to test changes / Special notes to the reviewer:**

Signed-off-by: Charlie Drage <[email protected]>

docs/website/versioned_docs/version-3.0.0/getting-started/cluster-setup/kubernetes.md

@@ -11,7 +11,7 @@ This guide is helpful in setting up a development environment intended to be use
 
 `odo` can be used with ANY Kubernetes cluster. However, this development environment will ensure complete coverage of all features of `odo`.
 
-## Prerequisites
+## Requirements
 
 * You have a Kubernetes cluster set up (such as [minikube](https://minikube.sigs.k8s.io/docs/start/))
 * You have admin privileges to the cluster

docs/website/versioned_docs/version-3.0.0/getting-started/cluster-setup/openshift.md

@@ -8,7 +8,7 @@ sidebar_position: 2
 ## Introduction
 This guide is helpful in setting up a development environment intended to be used with `odo`; this setup is not recommended for a production environment.
 
-## Prerequisites
+## Requirements
 * You have a OpenShift cluster set up (such as [crc](https://crc.dev/crc/#installing-codeready-containers_gsg))
 * You have admin privileges to the cluster