Document $update_serial=false parameter in DNS rr API calls

remoting_client/API-docs/dns_a_add.html

remoting_client/API-docs/dns_a_delete.html

remoting_client/API-docs/dns_a_update.html

remoting_client/API-docs/dns_aaaa_add.html

remoting_client/API-docs/dns_aaaa_delete.html

remoting_client/API-docs/dns_aaaa_update.html

remoting_client/API-docs/dns_alias_add.html

remoting_client/API-docs/dns_alias_delete.html

remoting_client/API-docs/dns_alias_update.html

remoting_client/API-docs/dns_cname_add.html

remoting_client/API-docs/dns_cname_delete.html

remoting_client/API-docs/dns_cname_update.html

remoting_client/API-docs/dns_hinfo_add.html

remoting_client/API-docs/dns_hinfo_delete.html

remoting_client/API-docs/dns_hinfo_update.html

remoting_client/API-docs/dns_mx_delete.html

remoting_client/API-docs/dns_mx_update.html

remoting_client/API-docs/dns_naptr_add.html

remoting_client/API-docs/dns_naptr_delete.html

remoting_client/API-docs/dns_naptr_update.html