Rename 'innodb_stats_auto_recalc' to 'innodb_stats_persistent_auto_recalc'

There is a bit of confusion with InnoDB statistics persistent vs volatile with documentation.
To make things more clear I think all variables only related to persistent stats should follow the hyerarchical naming convention I see in use:

For example:

innodb_stats_auto_recalc

Description: If set to 1 (the default), persistent statistics are automatically recalculated when the table changes significantly (more than 10% of the rows). [...]

I would see more appropriate:

innodb_stats_persistent_auto_recalc