small fix

docutranslate/static/index.html

@@ -360,7 +360,7 @@
             <div class="form-group">
                 <label for="convert_engin">解析引擎</label>
                 <select id="convert_engin" name="convert_engin">
-                    <option value="mineru" selected>minerU(推荐)</option>
+                    <option value="mineru" selected>minerU（推荐）</option>
                     <option value="docling" id="docling">Docling</option>
                 </select>
             </div>