Update input-requirements.md

Author: jaep3347

articles/ai-services/document-intelligence/includes/input-requirements.md

@@ -32,6 +32,8 @@ Supported file formats:
 
 * For custom model training, the maximum number of pages for training data is 500 for the custom template model and 50,000 for the custom neural model.
 
-  * For custom extraction model training, the total size of training data is 50 MB for template model and `1` GB for the neural model.
+* For custom extraction model training, the total size of training data is 50 MB for template model and `1` GB for the neural model.
 
-  * For custom classification model training, the total size of training data is `1` GB  with a maximum of 10,000 pages. For 2024-11-30 (GA), the total size of training data is `2` GB with a maximum of 10,000 pages.
+* For custom classification model training, the total size of training data is `1` GB  with a maximum of 10,000 pages. For 2024-11-30 (GA), the total size of training data is `2` GB with a maximum of 10,000 pages.
+    
+* For office file types (docx, xlsx, pptx), there is a maximum string length limit of 8000000.