Unfortunately, there is no way to change you hubs URL/Web a address once published but your hub's web address really don't matter.
The important is your hub title and you can change it any time and search engine reads only your Hub Title and not even see Hub URL, your hub will be listed in search engine for the keywords in your Title and content and not for hubs URL.
You can change Title and Correct it for any spelling or grammatical mistakes anytime not bothering about Hub URL
I personally changed title of most of my hubs, they perform better than before for new keywords in title even URL is same as before. So, if you are bothering that different URL and Hub Title would affect your Hub badly, stop worrying and you can change title.
Otherwise you can delete and republish hub if you really want to change Hub URL but if your hub is older enough, it may have some negative/positive impact.