It's a pretty large changelog with lots of bug fixes:
https://mariadb.com/kb/en/library/mariadb-10210-changelog/
FreeBSD users must upgrade again manually:
1. Go to /usr/local/directadmin/custombuild
2. ./build update
3. rm -rf mariadb-10.2.10
4. tar -zxvf mariadb-10.2.10.tar.gz
5. cd mariadb-10.2.10
5. cmake -DPLUGIN_TOKUDB=NO -DPLUGIN_OQGRAPH=NO -DPLUGIN_MROONGA=NO -DPLUGIN_ROCKSDB=NO -DWITHOUT_MROONGA_STORAGE_ENGINE=YES -DWITHOUT_TOKUDB_STORAGE_ENGINE=YES -DWITHOUT_ROCKSDB_STORAGE_ENGINE=YES
6. make install
7. restart:
/usr/local/etc/rc.d/mysqld restart
8. perform mysql-upgrade manually:
./client/mysql_upgrade -uda_admin -p
https://mariadb.com/kb/en/library/mariadb-10210-changelog/
FreeBSD users must upgrade again manually:
1. Go to /usr/local/directadmin/custombuild
2. ./build update
3. rm -rf mariadb-10.2.10
4. tar -zxvf mariadb-10.2.10.tar.gz
5. cd mariadb-10.2.10
5. cmake -DPLUGIN_TOKUDB=NO -DPLUGIN_OQGRAPH=NO -DPLUGIN_MROONGA=NO -DPLUGIN_ROCKSDB=NO -DWITHOUT_MROONGA_STORAGE_ENGINE=YES -DWITHOUT_TOKUDB_STORAGE_ENGINE=YES -DWITHOUT_ROCKSDB_STORAGE_ENGINE=YES
6. make install
7. restart:
/usr/local/etc/rc.d/mysqld restart
8. perform mysql-upgrade manually:
./client/mysql_upgrade -uda_admin -p