doc: Adding helper sample usage
doc: Adding helper sample usage

Some helpers like the 'in()' were not very easy to understand about the
usage or the syntax.

This commit does add some examples.

enovance/edeploy,lebauce/edeploy,redhat-cip/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy