Update service-limits.md

I think the current explanation about training dataset size for Template model is not sufficient because the limit of total dataset limit is not written in this document.
As far as I checked the message of Form Recognizer Portal, the total dataset size is 150 MB so I added the table about total training dataset size for Template model.

Author: verb55nta

articles/applied-ai-services/form-recognizer/service-limits.md

@@ -80,7 +80,9 @@ This article contains both a quick reference and detailed description of Azure F
 | Adjustable | No | No |
 | **Training dataset size * Neural** | 1 GB <sup>3</sup> | 1 GB (default value) |
 | Adjustable | No | No |
-| **Training dataset size * Template** | 50 MB <sup>4</sup> | 50 MB (default value) |
+| **Training file size * Template** | 50 MB <sup>4</sup> | 50 MB (default value) |
+| Adjustable | No | No |
+| **Total Training dataset size * Template** | 150 MB <sup>4</sup> | 150 MB (default value) |
 | Adjustable | No | No |
 | **Max number of pages (Training) * Template** | 500 | 500 (default value) |
 | Adjustable | No | No |