[PS-6951] Document RocksDB variables: rocksdb_delete_cf, rocksdb_enable_iterate_bounds, and rocksdb_enable_remove_orphaned_dropped_cfs - Percona JIRA

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1. Mark the `rocksdb_read_free_rpl_tables` variable as disabled because it's dangerous to use. Please use "rocksdb_read_free_rpl" instead.

2. Add a new variable "rocksdb_delete_cf":

   :dyn: Yes
   :scope: Global
   :vartype: String
   :default: "" (empty string)

"Delete column family by name e.g."
"SET @@global.ROCKSDB_DELETE_CF = 'cf_primary_key'"

3. Add a new variable "rocksdb_enable_iterate_bounds":

   :dyn: Yes
   :scope: Global, Local
   :vartype: BOOL
   :default: TRUE

   "Enable rocksdb iterator upper/lower bounds in read options."

4. Add a new variable "rocksdb_enable_remove_orphaned_dropped_cfs":

   :dyn: Yes
   :scope: Global
   :vartype: BOOL
   :default: TRUE

                         "Enables removing dropped cfs from metadata if it "
                         "doesn't exist in cf manager",

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