Add several spelling corrections (#2357)

* Add several spelling corrections  
* Update codespell_lib/data/dictionary.txt  
Co-authored-by: Peter Newman <peternewman@users.noreply.github.com>
* Move predicable->predictable to rare  
* Added 'isa' version  
Co-authored-by: Peter Newman <peternewman@users.noreply.github.com>