Add more information on vm map count setting (#241)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

Issue link:#[[Link the issue
here](https://github.com/infiniflow/ragflow/issues/236)]

### Type of change

- [x] Documentation Update

rag/app/naive.py

@@ -60,7 +60,7 @@ class Docx(DocxParser):
                     html += f"<td>{c.text}</td>" if span == 1 else f"<td colspan='{span}'>{c.text}</td>"
                 html += "</tr>"
             html += "</table>"
-        tbls.append(((None, html), ""))
+            tbls.append(((None, html), ""))
         return [(l, "") for l in lines if l], tbls