Import typos from mdadm history (#875)

* Add canot->cannot

* Add checheckpoit->checkpoint

* Add checheckpoits->checkpoints

* Add covert->convert

* Add expanssion->expansion

* Add fileststem->filesystem

* Add matc->match

* Add mosty->mostly

* Add mutipath->multipath

* Add sh1sum->sha1sum

* Revert "Add covert->convert"

This reverts commit 415e4599a0223e32e022f6e7605756ab745078af.