One typo in a description field should be easy with Bulk Edit... One at a time... doing the Item Description only....
Should take some time... but not as much as when revision one listing at a time....
Last year in January my postage information....in each listing... had to be changed
I had all of my new information in a separate document ... and did a delete/add for over 3000 listings... very easy with Bulk Edit, one listing at a time....