I find on sublime 3 that if I autocomplete code I sometimes get an extra angular bracket.
for example, If I start writing
<<!DOCTYPE html> <!-- Extra angle bracket here -->
Okay, so I found your solution, but keep in mind, it might bug in the coming updates.
First goto your installation destination and open the folder
Packages, in there open
HTML.sublime-package as archive and copy all the content in a seperate folder on your desktop. In that new folder, edit the file
html.sublime-snippet and change
This should solve your problem.