[Maria-docs] docs request: METADATA_LOCK_INFO

First: is the list a good place for a documentation request? This is about metadata_lock_info plugin: https://mariadb.com/kb/en/metadata-lock-info/ I hope I'll see documentation about the possible values of LOCK_MODE and LOCK_TYPE columns. The latter column may seem ovious, but it is not: when are such locks acquired/released, what kind of operations are put on hold? Regards, Federico