chore: update warning message

src/changedFiles.ts

@@ -65,11 +65,11 @@ export const getRenamedFiles = async ({
             diff
           }))
         ) {
-          let message = `Set 'fetch_additional_submodule_history: true' to fetch additional submodule history for: ${submodulePath}`
+          let message = `Unable to use three dot diff for: ${submodulePath} submodule. Falling back to two dot diff. You can set 'fetch_additional_submodule_history: true' to fetch additional submodule history in order to use three dot diff`
           if (inputs.fetchSubmoduleHistory) {
             message = `To fetch additional submodule history for: ${submodulePath} you can increase history depth using 'fetch_depth' input`
           }
-          core.warning(message)
+          core.info(message)
           diff = '..'
         }