Fix empty response docs
Fix empty response docs

A couple end-points provided incorrect documentation for response when
deleting. The server does not return anything (on success). It is the
client that prints the "No content" message.

JIRA: PDC-980

puiterwijk/product-definition-center,release-engineering/product-definition-center,release-engineering/product-definition-center,xychu/product-definition-center,product-definition-center/product-definition-center,puiterwijk/product-definition-center,product-definition-center/product-definition-center,pombredanne/product-definition-center,release-engineering/product-definition-center,xychu/product-definition-center,product-definition-center/product-definition-center,pombredanne/product-definition-center,puiterwijk/product-definition-center,release-engineering/product-definition-center,pombredanne/product-definition-center,lao605/product-definition-center,lao605/product-definition-center,tzhaoredhat/automation,pombredanne/product-definition-center,xychu/product-definition-center,product-definition-center/product-definition-center,lao605/product-definition-center,tzhaoredhat/automation,tzhaoredhat/automation,lao605/product-definition-center,xychu/product-definition-center,tzhaoredhat/automation