Config changes to reflect the default branch from master to main.

Author: dstrome

.openpublishing.publish.config.json

@@ -35,15 +35,15 @@
   "sync_notification_subscribers": [],
   "branches_to_filter": [],
   "git_repository_url_open_to_public_contributors": "https://github.com/MicrosoftDocs/memdocs",
-  "git_repository_branch_open_to_public_contributors": "master",
+  "git_repository_branch_open_to_public_contributors": "main",
   "skip_source_output_uploading": false,
   "need_preview_pull_request": true,
   "contribution_branch_mappings": {},
   "dependent_repositories": [
     {
       "path_to_root": "_themes",
       "url": "https://github.com/Microsoft/templates.docs.msft",
-      "branch": "master",
+      "branch": "main",
       "branch_mapping": {}
     },
     {
@@ -55,7 +55,7 @@
     {
       "path_to_root": "_themes.pdf",
       "url": "https://github.com/Microsoft/templates.docs.msft.pdf",
-      "branch": "master",
+      "branch": "main",
       "branch_mapping": {}
     }
   ],