doc: update action.yml description and logg yamlfixer command

Author: mbarre

action.yml

@@ -7,7 +7,7 @@ branding :
 
 inputs:
   yaml_file:
-    description: "Yaml files to be tested (file without .yml or .yaml extension"
+    description: "Yaml files to be tested. By default, all files except the ones in .github/workflows/ are linted."
     required: false
   options:
     description: "Yamlfixer execution options"

entrypoint.sh

@@ -2,6 +2,7 @@
 
 cd /github/workspace/
 yamlfixer $OPTIONS --nochange  --diffto /tmp/changes.patch $(git ls-files '*.yaml' '*.yml' '.yamllint' | grep -v ^.github/workflows/) $YAML_FILE
+echo "yamlfixer $OPTIONS --nochange  --diffto /tmp/changes.patch $(git ls-files '*.yaml' '*.yml' '.yamllint' | grep -v ^.github/workflows/) $YAML_FILE"
 
 if [[ -s /tmp/changes.patch ]] ; then
   echo "WARN: all input files didn't pass successfully yamllint strict mode." ;