Update concepts-data-flow-expression-builder.md

Author: kromerm

articles/data-factory/concepts-data-flow-expression-builder.md

@@ -84,13 +84,12 @@ When you have column names that include special characters or spaces, surround t
 
 ## Manual comments
 
-```/* This is my comment */
+```/* This is my comment */```
 
-/* This is a
-   multi-line comment */
+```/* This is a```
+   ```multi-line comment */```
 
-// This is a single line comment
-```
+```// This is a single line comment```
 
 If you put a comment at the top of your expression, it will appear in the transformation text box to document your transformation expressions: