Adaptive hash index partitions is documented twice

Hi,

Adaptive hash index partitions are documented twice:

innodb_adaptive_hash_index_partitions
Description: Specifies the number of partitions for use in adaptive searching. If set to 1, no extra partitions are created. XtraDB-only
Commandline: innodb-adaptive-hash-index-partitions=#
Scope: Global
Dynamic: No
Data Type: numeric
Default Value: 1
Range: 1 to 64
Introduced: MariaDB 5.5.20

innodb_adaptive_hash_index_parts
Description: Specifies the number of partitions for use in adaptive searching. If set to 1, no extra partitions are created.
Commandline: innodb-adaptive-hash-index-parts=#
Scope: Global
Dynamic: No
Data Type: numeric
Default Value: 8
Range: 1 to 512
Introduced: MariaDB 10.2.2

Some questions arise:
Are there 2 different implementations of adaptive hash index partitions?
Does MySQL bug https://bugs.mysql.com/bug.php?id=81814 appluy to MariaDB's 5.5.20 implementation as well?