Update concepts-data-flow-performance.md

Author: kromerm

articles/data-factory/concepts-data-flow-performance.md

@@ -64,8 +64,8 @@ Azure Data Factory Mapping Data Flows provide a code-free browser interface to d
 
 * When unit testing data flows, set the "Data Flow Debug" button to ON.
 * Inside of the Data Flow designer, use the Data Preview tab on transformations to view the results of your transformation logic.
-* Unit test your data flows from the pipeline designer by placing a Data Flow acivity on the pipeline design canvas and use the "Debug" button to test.
-* Testing in debug mode will work against a live warmed cluster environment without the need to wait for a just-in-time cluser spin-up.
+* Unit test your data flows from the pipeline designer by placing a Data Flow activity on the pipeline design canvas and use the "Debug" button to test.
+* Testing in debug mode will work against a live warmed cluster environment without the need to wait for a just-in-time cluster spin-up.
 
 ### Disable indexes on write
 * Use an ADF pipeline stored procedure activity prior to your Data Flow activity that disables indexes on your target tables that are being written to from your Sink.