Issue #9456: updated example of AST for TokenTypes.INTERFACE_DEF

[theanmolsharma]

fixes #9456:

Source used to generate AST:

public interface MyInterface {
    
}

Generated AST:

INTERFACE_DEF -> INTERFACE_DEF [1:0]
|--MODIFIERS -> MODIFIERS [1:0]
|   `--LITERAL_PUBLIC -> public [1:0]
|--LITERAL_INTERFACE -> interface [1:7]
|--IDENT -> MyInterface [1:17]
`--OBJBLOCK -> OBJBLOCK [1:29]
    |--LCURLY -> { [1:29]
    `--RCURLY -> } [3:0]

Expected update for JavaDoc:

INTERFACE_DEF -> INTERFACE_DEF
|--MODIFIERS -> MODIFIERS
|   `--LITERAL_PUBLIC -> public
|--LITERAL_INTERFACE -> interface
|--IDENT -> MyInterface
`--OBJBLOCK -> OBJBLOCK
    |--LCURLY -> {
    `--RCURLY -> }

[romani]

@theanmolsharma , please focus on more complicated issues, like "second gsoc", "third gsoc", "easy", ... .
First gsoc issues are only entry level.