Fixes zendframework/zf2#2993 - Add missing asterisk to method docblock
Fixes zendframework/zf2#2993 - Add missing asterisk to method docblock

weierophinney/zend-http,asgrim/zend-http,Maks3w/zend-http,zendframework/zend-http,netroby/zend-http,malinink/zend-http