Update Dependabot configuration file comments

Author: chrisreddington

.github/dependabot.yml

@@ -1,8 +1,11 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for more information:
-# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-# https://containers.dev/guide/dependabot
+# This is the dependabot configuration file that automates dependency updates
+# Updates section configures how dependabot should handle dependency updates:
+# - Monitors devcontainer features in the root directory (though convention is .devcontainer and it should check there by default)
+# - Monitors NPM dependencies in the possible-solutions directory
+# - Checks for updates weekly
+# - Groups updates based on their type (dev grouped by minor/patch or prod grouped by patch)
+#
+# Learn more at https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#configuration-options-for-the-dependabotyml-file
 
 version: 2
 updates: