fixup! [ci][docs] Add job inputs for manually triggered workflows.

Author: hageboeck

.github/workflows/root-docs-ci.yml

@@ -13,13 +13,12 @@ on:
       input_branch:
         description: 'Which branch to build documentation for'
         type: string
-        required: false
-        default: 'master'
+        required: true
       eos_upload_directory:
         description: 'Make documentation available at <root-website>/doc/<directory>. Leave empty for skipping the upload to eos.'
         type: string
         required: false
-        default: 'master'
+        default: ''
 
   workflow_dispatch:
     inputs: