[java] Incorrectly refactored `typeParameter`

[kaby76]

The JLS defines typeParameter as the following.

TypeParameter:
    { TypeParameterModifier } TypeIdentifier [ TypeBound ]

TypeParameterModifier:
    Annotation

TypeBound:
    'extends' TypeVariable
    'extends' ClassOrInterfaceType { AdditionalBound }

AdditionalBound:
    '&' InterfaceType

On the contrary, the Antlr grammar defines typeParameter as the following.

grammars-v4/java/java/JavaParser.g4

Lines 106 to 112 in a0e876b

	typeParameter
	: annotation* identifier (EXTENDS annotation* typeBound)?
	;
	typeBound
	: typeType ('&' typeType)*
	;

Although they work, these rules are refactored incorrectly. For example, we see identifier used instead of typeIdentifier. People have been doing these refactorings off the top of their heads, but this is not how things should be done because it is not rigorous, and in most cases, wrong. We need to see the actual steps performed in the refactoring.