Add default to settings-path description

Co-Authored-By: Chris Patterson <chrispat@github.com>

Author: Bryan Clark

action.yml

@@ -31,7 +31,7 @@ inputs:
        repository.'
     required: false
   settings-path:
-    description: 'Path to where the settings.xml file will be written.'
+    description: 'Path to where the settings.xml file will be written. Default is ~/.m2.'
     required: false
 runs:
   using: 'node12'