docs: adds delete datasource by name

docs/sources/http_api/data_source.md

@@ -195,7 +195,7 @@ parent = "http_api"
 
     {"message":"Datasource updated", "id": 1, "name": "test_datasource"}
 
-## Delete an existing data source
+## Delete an existing data source by id
 
 `DELETE /api/datasources/:datasourceId`
 
@@ -213,6 +213,24 @@ parent = "http_api"
 
     {"message":"Data source deleted"}
 
+## Delete an existing data source by name
+
+`DELETE /api/datasources/name/:datasourceName`
+
+**Example Request**:
+
+    DELETE /api/datasources/name/test_datasource HTTP/1.1
+    Accept: application/json
+    Content-Type: application/json
+    Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+**Example Response**:
+
+    HTTP/1.1 200
+    Content-Type: application/json
+
+    {"message":"Data source deleted"}
+
 ## Data source proxy calls
 
 `GET /api/datasources/proxy/:datasourceId/*`