libvaladoc: Use Scanner.get_identifier_or_keyword() instead of outdated copy
libvaladoc: Use Scanner.get_identifier_or_keyword() instead of outdated copy

GNOME/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,frida/vala