docs(Chat): Add isTyping parameter (#3475)

Author: dimodi

components/chat/data-binding.md

@@ -76,7 +76,8 @@ The Chat component provides field mapping parameters to work with different data
 | `FilesField` | File attachments | `"Files"` |
 | `StatusField` | Message status | `"Status"` |
 | `IsDeletedField` | Indicates if the message is deleted | `"IsDeleted"` |
-| `IsPinnedField` | Iindicaties if the message is pinned | `"IsPinned"` |
+| `IsPinnedField` | Indicaties if the message is pinned | `"IsPinned"` |
+| `IsTypingField` | Indicaties if the message author is currently typing | `"IsTyping"` |
 | `ReplyToIdField` | The ID of replied message | `"ReplyToId"` |
 | `SuggestedActionsField` | Predefined quick replies | `"SuggestedActions"` |