fix typo

class name didn't match

Author: coke

doc/Type/X/Does/TypeObject.pod6

@@ -22,7 +22,7 @@ grammar IntegralParser does AlgebraParser { ... };
 Roles may only be runtime-mixed into defined object instances:
 
 =for code :skip-test
-GrassmanNumber.new does AlgebraDebugger;
+GrassmannNumber.new does AlgebraDebugger;
 
 (This restriction may be worked around by using
 L<augment or supersede|/language/variables#The_augment_Declarator>, or