Add quotes around namespace in yq command README (#102)

Description of changes:
For yq command to work " " are needed around namespace otherwise there will be a lexical error.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: ryansteakley

README.md

@@ -186,7 +186,7 @@ helm chart export $CHART_REF --destination $CHART_EXPORT_PATH
       yq e '.aws.region = env(AWS_DEFAULT_REGION)' -i values.yaml
       yq e '.aws.account_id = env(AWS_ACCOUNT_ID)' -i values.yaml
       yq e '.serviceAccount.annotations."eks.amazonaws.com/role-arn" = env(IAM_ROLE_ARN_FOR_IRSA)' -i values.yaml
-      yq e '.installScope = namespace' -i values.yaml
+      yq e '.installScope = "namespace"' -i values.yaml
       cd -
       ```
 ##### 3.1.3 Install Controller