HBASE-26458 Update Snapshot TTL doc (#3852)
HBASE-26458 Update Snapshot TTL doc (#3852)

Signed-off-by: Duo Zhang <ca823f7b4f21a31b6ef7892c1f90d53103f0d135@apache.org>
Signed-off-by: Viraj Jasani <0f008b677517e222a5b140e7cfedb6aed7df6c3b@apache.org>
ndimiduk/hbase,ndimiduk/hbase,mahak/hbase,ndimiduk/hbase,mahak/hbase,apurtell/hbase,apurtell/hbase,mahak/hbase,ndimiduk/hbase,mahak/hbase,Apache9/hbase,Apache9/hbase,Apache9/hbase,mahak/hbase,ndimiduk/hbase,mahak/hbase,apurtell/hbase,ndimiduk/hbase,ndimiduk/hbase,apurtell/hbase,mahak/hbase,Apache9/hbase,Apache9/hbase,mahak/hbase,apurtell/hbase,apurtell/hbase,Apache9/hbase,apurtell/hbase,apurtell/hbase,Apache9/hbase,Apache9/hbase,mahak/hbase,ndimiduk/hbase,ndimiduk/hbase,apurtell/hbase,Apache9/hbase,apurtell/hbase,mahak/hbase,Apache9/hbase,ndimiduk/hbase