Update comments to reflect RFC2251 specs.

libraries/libldap/abandon.c

libraries/libldap/add.c

libraries/libldap/bind.c

libraries/libldap/compare.c

libraries/libldap/controls.c

libraries/libldap/delete.c

libraries/libldap/extended.c

libraries/libldap/kbind.c

libraries/libldap/modrdn.c

libraries/libldap/result.c

libraries/libldap/sbind.c

libraries/libldap/search.c

libraries/libldap/unbind.c