Update build-pdf.yml

Add an extra string for setting the revision mark to Stable.

Signed-off-by: Rafael Sene <[email protected]>

Author: rpsene

.github/workflows/build-pdf.yml

@@ -9,7 +9,7 @@ on:
         required: true
         type: string
       revision_mark: 
-          description: 'Set revision mark as Draft or Release:'
+          description: 'Set revision mark as Draft, Release or Stable:'
           required: true
           type: string
           default: 'Draft'