fix MarkupLMProcessor option flag (#19526)

docs/source/en/model_doc/markuplm.mdx

@@ -178,7 +178,7 @@ processor will use the feature extractor to get all nodes and xpaths, and create
 dict_keys(['input_ids', 'token_type_ids', 'attention_mask', 'xpath_tags_seq', 'xpath_subs_seq'])
 ```
 
-**Use case 5: web page question answering (inference), apply_ocr=False**
+**Use case 5: web page question answering (inference), parse_html=False**
 
 For question answering tasks (such as WebSRC), you can provide a question to the processor. If you have extracted
 all nodes and xpaths yourself, you can provide them directly to the processor. Make sure to set `parse_html` to `False`.