Update ternary_operators.rst (#208)

Fix the blueprint for the ternary operator

Author: Pablo Navarro

ternary_operators.rst

@@ -12,7 +12,7 @@ expressions.
 
 .. code:: python
 
-    condition_if_true if condition else condition_if_false
+    value_if_true if condition else value_if_false
 
 **Example:**