Corrected Type for adding data (SharePoint#4185)

On the page https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/get-to-know-the-sharepoint-rest-service
Corrected Type for adding data in a code that adds an item to a list sample data.

Author: nanddeepn

docs/sp-add-ins/get-to-know-the-sharepoint-rest-service.md

@@ -122,12 +122,14 @@ The following table contains typical REST endpoint URL examples to get you start
 ```json
 {
   '__metadata': {
-    'type': SP.Data.'listname'.ListItem
+    'type': 'SP.Data.listname.ListItem'
   },
   'Title': 'MyItem'
 }
 ```
 
+In the above JSON, replace listname with the name of your SharePoint list by omitting the spaces.
+
 <a name="batch"> </a>
 
 ## Batch job support