Yesterday I reported how Google Maps dropped the ability to edit your introductory or description business field. It wasn't showing on your Google Maps listing anyway, and it is hard to find on your Google+ business listing.
But you can still edit it, just not on your Google My Business page.
To do so, go to aboutme.google.com and click on the top right to go to the right Google profile. Then where it says the story option, click on the pencil icon:
Then this little dialog will pop up where you can edit the information and replace it:
Again, this is not shown on Google Maps anymore but if you want to edit it, you can over here.
This was the number one question I got after posting this news and thankfully Elizabeth from Google shared how to do it.
Forum discussion at Google My Business Help.