fix(parser): update examples

examples/00_syntax_prototype/01_simple_types.py

@@ -7,7 +7,7 @@ from __future__ import annotations
 df: Frame[
     verified: bool,
     birth_year: int,
-    height: float,
+    height: float + ( _ > 0 ) + ( _ < 250 ),
     name: str,
     date: datetime,
     float,  # unnamed

examples/00_syntax_prototype/02_custom_types.midas

@@ -16,7 +16,7 @@ op <Latitude> - <Latitude> = <LatitudeDiff>
 op <Longitude> - <Longitude> = <LongitudeDiff>
 
 // Simple custom type with a constraint
-type Age<int + (0 <= _ < 150)>
+type Age<int + (0 <= _) + (_ < 150)>
 
 // Predefined custom constraints that can be referenced in other definitions
 constraint Positive = _ >= 0