Improve RELEASE.md

- address word wrap issue in validation instructions

RELEASE.md

@@ -243,9 +243,11 @@ Public keys are available at: https://www.apache.org/dist/pulsar/KEYS
 
 For convenience "index.yaml" has been uploaded (though excluded from voting), so you can also run the below commands.
 
-helm repo add --force-update apache-pulsar-dist-dev https://dist.apache.org/repos/dist/dev/pulsar/helm-chart/$VERSION_RC/
+helm repo add --force-update \
+ apache-pulsar-dist-dev https://dist.apache.org/repos/dist/dev/pulsar/helm-chart/$VERSION_RC/
 helm repo update
-helm install pulsar apache-pulsar-dist-dev/pulsar --version ${VERSION_WITHOUT_RC} --set affinity.anti_affinity=false
+helm install pulsar apache-pulsar-dist-dev/pulsar \
+ --version ${VERSION_WITHOUT_RC} --set affinity.anti_affinity=false
 
 pulsar-${VERSION_WITHOUT_RC}.tgz.prov - is also uploaded for verifying Chart Integrity, though it is not strictly required for releasing the artifact based on ASF Guidelines. 
 
@@ -404,9 +406,14 @@ Contributors can run below commands to test the Helm Chart
 ```shell
 export VERSION_RC=3.0.0-candidate-1
 export VERSION_WITHOUT_RC=${VERSION_RC%-candidate-*}
-helm repo add --force-update apache-pulsar-dist-dev https://dist.apache.org/repos/dist/dev/pulsar/helm-chart/$VERSION_RC/
+```
+
+```shell
+helm repo add --force-update \
+ apache-pulsar-dist-dev https://dist.apache.org/repos/dist/dev/pulsar/helm-chart/$VERSION_RC/
 helm repo update
-helm install pulsar apache-pulsar-dist-dev/pulsar --version ${VERSION_WITHOUT_RC} --set affinity.anti_affinity=false
+helm install pulsar apache-pulsar-dist-dev/pulsar \
+ --version ${VERSION_WITHOUT_RC} --set affinity.anti_affinity=false
 ```
 
 You can then perform any other verifications to check that it works as you expected by