I don't know of any way out of the box to do this, but you can use the Design Checker in conjunction with the Tasck Scheduller to find spellling errrors in a folder or set of files. I don't think it will fix those problem words, but it will give you a report so you know which drawings to update. Run it each night and you'll know in the morning.
Hope that helps.
There is a macro from Josh Brady that pop up a message of saving or adding file properties when you try to close/save a file. You may edit that for spell checked (may be). Sorry can't find the link right now.
I noticed there is a feature in Design Checker specifically for spell checking. Don't know if that might help or not.