As John Arnold pointed out, the museum world is related to education.
However, museum-l is an informal discussion group, not an academic
journal.  Errors in spelling and grammar do appear and sometimes make
me cringe, but I try to overlook them for that reason (I know I make
mistakes myself.)  If you do feel the mistakes someone has made are worth
correcting, I think it would be a lot nicer to send a note to the person
privately, instead of embarrassing them again by posting it to the entire
list.