Fix environment variables in documentation

[upgradingdave]

Hi Team, I noticed a spelling mistake here:

rpa-worker/README.adoc

Line 283 in c920669

$ docker run --rm -it \

CAMUNDA_CLICNE_CLUSTERID should be changed to CAMUNDA_CLIENT_CLUSTERID

Also, in application.properties I see this: camunda.client.cloud.cluster-id. The Spring ENV translation should be CAMUNDA_CLIENT_CLOUD_CLUSTERID. Why does the README suggest CAMUNDA_CLIENT_CLUSTERID?

Also, in application.properties', I see this: camunda.client.cloud.region. The spring ENV translation should be CAMUNDA_CLIENT_CLOUD_REGION. Why does the README suggest CAMUNDA_CLIENT_REGION`?