Update summarizecolumns-function-dax.md

- updated names of columns in an example output to match the names defined in the corresponding example DAX code
- changed a call of a DAX function in an example to upper case to match writing style used in that and other examples on this page

Author: brandonpires

query-languages/dax/summarizecolumns-function-dax.md

@@ -102,14 +102,14 @@ All expression ignored,
 ```dax
 SUMMARIZECOLUMNS( 
     Sales[CustomerId], "Blank", 
-    IGNORE( Blank() ), "BlankIfTotalQtyIsNot5", 
+    IGNORE( BLANK() ), "BlankIfTotalQtyIsNot5", 
     IGNORE( IF( SUM( Sales[Qty] )=5, 5 ) ) 
 )
 ```
 
 Even though both expressions return blank for some rows, they're included since there are no unignored expressions which return blank.  
 
-|CustomerId|TotalQty|BlankIfTotalQtyIsNot3|  
+|CustomerId|Blank|BlankIfTotalQtyIsNot5|  
 |--------------|------------|-------------------------|  
 |A||5|  
 |B|||