Updating HAProxy snapshot documentation v1.5.3 generated by haproxy-dconv v0.3.1-23

87b7ac9 [RELEASE] Released version 1.5.3
Updating HAProxy stable documentation v1.5.3 generated by haproxy-dconv v0.3.1-23

87b7ac9 [RELEASE] Released version 1.5.3
de9789b DOC: fix typo in Unix Socket commands