Merge pull request #102193 from diberry/diberry/0123-qna-filename-limit

[Cogsvcs] QnA Maker - limits add

Author: PRMerger6

articles/cognitive-services/QnAMaker/limits.md

@@ -1,16 +1,8 @@
 ---
 title: Limits and boundaries - QnA Maker
-titleSuffix: Azure Cognitive Services
 description: QnA Maker has meta-limits for parts of the knowledge base and service. It is important to keep your knowledge base within those limits in order to test and publish.
-services: cognitive-services
-author: diberry
-manager: nitinme
-ms.service: cognitive-services
-ms.subservice: qna-maker
 ms.topic: article
-ms.date: 12/10/2019
-ms.author: diberry
-ms.custom: seodec18
+ms.date: 01/23/2020
 ---
 
 # QnA Maker knowledge base limits and boundaries
@@ -29,6 +21,15 @@ The maximum number of knowledge bases is based on [Azure Cognitive Search tier l
 
 ## Extraction Limits
 
+### File naming constraints
+
+File names may not include the following characters:
+
+|Do not use character|
+|--|
+|Single quote `'`|
+|Double quote `"`|
+
 ### Maximum file size
 
 |Format|Max file size (MB)|