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

Closes #1523

ksarch-saas/redis,ramonsnir/redis,HunanTV/redis,spearhead-ea/redis,himoca/redis,louisliangjun/redis,darksideofthemoo/redis-histogram,ttuna/msot-redis,himoca/redis,darksideofthemoo/redis-histogram,HunanTV/redis,louisliangjun/redis,MSOpenTech/redis,xuzhezhaozhao/redis_reading,darksideofthemoo/redis-histogram,louisliangjun/redis,jxwr/redis,maodeyi/redis_lua,MSOpenTech/redis,louisliangjun/redis,splitice/redis,ksarch-saas/redis,MSOpenTech/redis,darksideofthemoo/redis-histogram,spearhead-ea/redis,spearhead-ea/redis,maodeyi/redis_lua,xuzhezhaozhao/redis_reading,xuzhezhaozhao/redis_reading,ttuna/msot-redis,ramonsnir/redis,himoca/redis,HunanTV/redis,slfs007/mk-redis,ttuna/msot-redis,ramonsnir/redis,slfs007/mk-redis,jxwr/redis,ttuna/msot-redis,ksarch-saas/redis,jxwr/redis,MSOpenTech/redis,MSOpenTech/redis,splitice/redis,splitice/redis,xuzhezhaozhao/redis_reading,ksarch-saas/redis,splitice/redis,ttuna/msot-redis,HunanTV/redis,slfs007/mk-redis,maodeyi/redis_lua