docs: default action inputs values for config-file

Signed-off-by: Alexander Korpusov <alpost@zoho.com>

action.yml

@@ -32,15 +32,15 @@ inputs:
     required: false
     default: "markdown table"
   output-method:
-    description: Method should be one of `replace`, `inject`, or `print`
+    description: Method should be one of `replace`, `inject`, or `print`. Set as an empty string if `output.mode` and `output.file` are defined in config-file
     required: false
     default: "inject"
   output-file:
     description: File in module directory where the docs should be placed
     required: false
     default: "README.md"
   template:
-    description: When provided will be used as the template if/when the `output-file` does not exist
+    description: When provided will be used as the template if/when the `output-file` does not exist. Set as an empty string if `output.template` is defined in config-file
     default: |-
       <!-- BEGIN_TF_DOCS -->
       {{ .Content }}