MDEV-6281 Typo in mysql_install_db scripts
and collateral changes:

* remove mysql_tableinfo.1 and references to it (there's no mysql_tableinfo)
* for debian: create manpages for mysqlrepair, mysqlanalyze, mysqloptimize
  (as symlinks for mysqlcheck.1, just as executables are symlinks to mysqlcheck)
* remove mysqlmanager.8 and references to it
* correct "very long line" error in mysqladmin.1
* simplify and fix table formatting in mysqlbinlog.1 and mysqldump.1
* fix a typo in the help text in mysql_install_db
* aria_chk: say "for Linux on x86_64", like other tools do
  (not "for Linux at x86_64")
* add simple manpages for aria_* utilities