build: update PR auto create

Author: GalvinGao

.github/workflows/pr-auto-upsert.yml

@@ -33,8 +33,9 @@ jobs:
           # replace newlines with \n
           sed -i ':a;N;$!ba;s/\n/\\n/g' /tmp/commit_messages.txt
 
-          echo "commit_messages:"
+          echo "commit messages:\n"
           cat /tmp/commit_messages.txt
+          echo "\n"
 
           curl https://api.openai.com/v1/chat/completions \
             -H "Content-Type: application/json" \
@@ -72,8 +73,9 @@ jobs:
           # replace " with \"
           sed -i 's/"/\\"/g' /tmp/summary.txt
 
-          echo "summary:"
+          echo "summary:\n"
           cat /tmp/summary.txt
+          echo "\n"
 
           echo "summary=$(cat /tmp/summary.txt)" >> $GITHUB_OUTPUT