PROTON-1437: clarify apidoc for pn_proactor_addr_str
PROTON-1437: clarify apidoc for pn_proactor_addr_str

kgiusti/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,alanconway/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,alanconway/qpid-proton