improved update-docs script

Author: riccardoferretti

.github/workflows/update-docs.yml

@@ -34,7 +34,7 @@ jobs:
 
           # Strip autogenerated wikileaks references because
           # they are not an appropriate default user experience.
-          (cd foam-template/docs; sed -i '/\[\/\/begin\]/,/\[\/\/end\]/d' $(find . -type f -name \*.md))
+          (cd foam-template/docs; find . -type f -name '*.md' -exec sed -i '/\[\/\/begin\]/,/\[\/\/end\]/d' {} +)
 
           # Set the commit message format
           echo "message=Docs sync @ $(cd foam; git log --pretty='format:%h %s')" >> $GITHUB_OUTPUT