PS-8287 Move the "version info" to the variable descriptions (5.7)

[alina-derkach-oaza]

modified: doc/source/diagnostics/innodb_show_status.rst modified: doc/source/management/audit_log_plugin.rst modified: doc/source/management/innodb_kill_idle_trx.rst modified: doc/source/myrocks/variables.rst modified: doc/source/performance/aio_page_requests.rst modified: doc/source/performance/prefix_index_queries_optimization.rst modified: doc/source/scalability/innodb_io.rst modified: doc/source/security/data-at-rest-encryption.rst modified: doc/source/tokudb/tokudb_file_management.rst modified: doc/source/tokudb/tokudb_variables.rst