Display 1.2 bouncing ball has a typo in the Math Hall of ContentExamples

Just a typo that needs to be fixed.

1. Open ContentExamples in the editor
2. Open the Math_Hall map and PIE
3. Navigate to the 1.2 ABS display and turn around to look at the bouncing ball example display

Result: It is labeled as 1.3

Expected: Should be labeled as 1.2 since it is 1.2's example display