People have rooted those from autos but very unlikely you will be successful with out experience in cloning.
How ever! Dosen’t mean don’t try and just see what happens 
You’re plant is fine though my freind.
You basically just “topped it”.
In the future if it ever happens again, tape it back in place immediately! And just make sure it is supported well and it will heal its self… absolutely any kind of tape works or even if no tape, just rig it up anyway you can that is secure with whatever you can tie it up with…
People will tell you to add all sorts of things to the wound and it may help, but it is not necessary.
Check out my first auto grow if you’reinterested, I broke 2 of mine like this, I taped one up and not the other.
Both are beautiful plants now with huge nugs…
If you search here for “auto clones” you will find people that top their autos and then root the top and they will flower out 