test-art: Fix comment in types.h

The comment references INCLUDE_MEMORY but the code actually
checks INCLUDE_VECTOR. So fix up the comment to mention
INCLUDE_VECTROR.

Pushed as obvious.

gcc/ChangeLog:

	* text-art/types.h: Fix comment.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>