Fix comment inconsistencies in ziplist.c
Fix comment inconsistencies in ziplist.c

Closes #1523

Jonavin/redis,shanegxxiao/redis,enginekit/redis,quangnguyen90/redis,damy/redis,laurencee/redis,sidsen/redis,damy/redis,LittlePeng/redis,quangnguyen90/redis,upsoft/redis,jqk6/redis,erwin00776/redis-2.8-optimize,laurencee/redis,jqk6/redis,LittlePeng/redis,quangnguyen90/redis,hanmichael/redis,alpha8/redis,jaambee/redis,adamweixuan/redis,upsoft/redis,kts12345/redis,miminus/redis,upsoft/redis,kolonse/redis,janeasystems/redis,enginekit/redis,alpha8/redis,jaambee/redis,miminus/redis,sidsen/redis,jqk6/redis,shanegxxiao/redis,alpha8/redis,quangnguyen90/redis,laurencee/redis,ideaar/redis,adamweixuan/redis,kolonse/redis,liqiang199105/redis,shanegxxiao/redis,sidsen/redis,adamweixuan/redis,ScottKaiGu/redis,enginekit/redis,kts12345/redis,Jonavin/redis,upsoft/redis,jqk6/redis,alpha8/redis,enginekit/redis,erwin00776/redis-2.8-optimize,jacklee0810/redis,Jonavin/redis,hanmichael/redis,kts12345/redis,adamweixuan/redis,quangnguyen90/redis,upsoft/redis,alpha8/redis,ScottKaiGu/redis,ideaar/redis,liqiang199105/redis,janeasystems/redis,jacklee0810/redis,ScottKaiGu/redis,laurencee/redis,LittlePeng/redis,damy/redis,miminus/redis,erwin00776/redis-2.8-optimize,adamweixuan/redis,jacklee0810/redis,jacklee0810/redis,janeasystems/redis,sidsen/redis,kts12345/redis,jqk6/redis,Cybermaxs/redis,Cybermaxs/redis,janeasystems/redis,miminus/redis,ideaar/redis,liqiang199105/redis,shanegxxiao/redis,hanmichael/redis,Cybermaxs/redis,janeasystems/redis,jacklee0810/redis,jaambee/redis,sidsen/redis,damy/redis,kolonse/redis,shanegxxiao/redis,sidsen/redis,kolonse/redis,liqiang199105/redis,ScottKaiGu/redis,ScottKaiGu/redis,kts12345/redis,ideaar/redis,ideaar/redis,hanmichael/redis,erwin00776/redis-2.8-optimize,Cybermaxs/redis,liqiang199105/redis,jaambee/redis,laurencee/redis,damy/redis,jaambee/redis,enginekit/redis,Cybermaxs/redis,hanmichael/redis,kolonse/redis,Jonavin/redis,Jonavin/redis,miminus/redis