update "edit this page" target branch to new default branch "main"

Author: ac6y

index.html

@@ -31,7 +31,7 @@
           target: 'h1, h2, h3, h4, h5, h6'
       },
       plugins: [
-        EditOnGithubPlugin.create( "https://github.com/slaclab/sdf-docs/blob/s3df/", null, function(file){ return "Edit page"}),
+        EditOnGithubPlugin.create( "https://github.com/slaclab/sdf-docs/blob/main/", null, function(file){ return "Edit page"}),
         function(hook) {
           var header = [ '<header>', '<span><img src="assets/slac_s3df_acronym_long_screen_small.png" height="50vh" /></span>', '</header>' ].join('');
           hook.afterEach(function(html) {