Remove link to private repository

Author: crynobone

.github/ISSUE_TEMPLATE/config.yml

@@ -6,6 +6,3 @@ contact_links:
   - name: Support Question
     url: https://nova.laravel.com/docs/4.0/support.html#support-questions
     about: This repository is only for reporting bugs. If you have a question or need help using the library
-  - name: Documentation Issue
-    url: https://github.com/laravel/nova-docs
-    about: For documentation issues, open a pull request in the laravel/nova-docs repository