fix control reference

Author: lancedMicrosoft

powerapps-docs/maker/canvas-apps/working-with-variables.md

@@ -100,7 +100,7 @@ Let's rebuild our adding machine by using a global variable:
 
 3. To update the running total whenever a user selects the **Add** button, set its **[OnSelect](controls/properties-core.md)** property to this formula:
 
-    **Set( RunningTotal, RunningTotal + Text1 )**
+    **Set( RunningTotal, RunningTotal + TextInput1 )**
 
     The first time a user selects the **Add** button and **[Set](functions/function-set.md)** is called, **RunningTotal** is created with a default value of *blank*.  In the addition, it will be treated as a zero.
 
@@ -163,7 +163,7 @@ Let's rebuild our adding machine by using a context variable:
 
 3. To update the running total whenever a user selects the **Add** button, set its **[OnSelect](controls/properties-core.md)** property to this formula:
 
-    **UpdateContext( { RunningTotal: RunningTotal + Text1 } )**
+    **UpdateContext( { RunningTotal: RunningTotal + TextInput1 } )**
 
     The first time a user selects the **Add** button and **[UpdateContext](functions/function-updatecontext.md)** is called, **RunningTotal** is created with a default value of *blank*.  In the addition, it will be treated as a zero.